Party All The Time

David Foster and girlfriend Katharine McPhee seem to know that the couple that plays together one-horse open sleighs together ... hey, it's that time of the year.

Dave and Kat were just two of many celebs that attended singer-songwriter Carole Bayer Sager and her hubby Bob Daly's holiday party Saturday night ... but it appears they were also among the few that actually performed onstage.

Kim Kardashian caught the magic on camera, showing D&K doing a rendition of "White Christmas" with the help of Babyface -- and then pairing off to do Kelly Clarkson's "My Grown Up Christmas List." Dave handled piano -- and, naturally, Kat was on vocals.

Other musicians like Keith Urban and Joe Walsh sang Xmas ditties as well, and were even joined by the likes of Hugh Jackman at one point.

Cardi B twerked like her life depended on it at HOT 97's Hot for the Holidays concert on Thursday -- and got rewarded for her efforts with a Colin Kaepernick meet-and-greet after the show!

You might've heard ... Cardi's been backing Kaep ever since she blew up with "Bodak Yellow" -- saying she was gonna boycott the NFL if no team signed him back in September.

Fast-forward a few months ... and the hip-hop star finally got to meet her favorite football player and his GF, Nessa -- a HOT 97 radio host -- backstage at the Prudential Center.

Nessa even congratulated Cardi for "being the sweetest and for poppin' that booty onstage!!!"

You're welcome:

Jamie Foxx might as well have been turning 35 this week instead of 50 by how many old-school hip-hop acts he booked for his birthday bash ... talk about memory lane.

Jamie rang in the big 5-0 Wednesday night at Paramount Pictures Studios with a straight-up concert, and he brought out the big guns with guys like Ice Cube, Snoop Dogg, Ludacris and Too Short.

The bday boy was onstage for most of the performances -- which included Cube's "Gangsta Gangsta," Luda's "Move B***H," and other '90s/2000s hits ... oldies but goodies in 2017.

Giancarlo Stanton wasn't in a hurry to leave Miami after he was traded to the Yankees -- he stuck around an extra day to rage in Miami with 2 Chainz.

The big trade news was announced late Friday night -- but less than 24 hours later, Stanton was at Rockwell x 1OAK Art Basel pop up event in Miami on Saturday ... where he got onstage and partied with the rapper.

Also, CHECK OUT THAT PINKY RING -- LEGENDARY!!!!!

2 Chainz also hooked Stanton up with a magnum sized bottle of Ace of Spades bubbly.

The ex-Marlins superstar is set to be introduced as the new face of the Yankees Monday ... so, this could have been his unofficial "goodbye" to the city he ran for half a decade.

It's almost kinda sad -- until you remember his $325 MILLION contract.

Scott Disick is back to his old ways ... 3 sheets at 3:30 PM Friday in Miami.

Scott was holding on for dear life, first with gf Sofia Richie and then with his buddy David Einhorn, aka Papi.

Scott and Sofia are in Miami for Art Basel, but it looks like he was way more interested in entertaining himself and others at his hotel.

He's been traveling all over the world with 19-year-old Sofia, but he also comes back to L.A. to spend time with his kids.

Good luck.

L.A.'s crackdown on Hollywood Hills house parties isn't sitting well with a couple of surfer bros who crashed a city council meeting, and punked the hell outta the old dudes.

Self-proclaimed "activist and house party enthusiast" Chad Kroeger addressed the city council this week to fight for the rights of his people, and stop the "future atroxity" of outlawed ragers. His impassioned plea was rudely interrupted. Some city council guy wasn't digging his story, apparently.

It's all good, though ... Chad's pal, JT, stepped to the mic and made an even bigger point on behalf of parties, saying they're good for the whole damn country.

If this all sounds like a joke, that's only because it is. "Chad" and "JT" did this earlier this year in San Clemente, CA ... where they fought for a 12-foot Paul Walker statue.

Yes, they're comedians and, if nothing else, they're making boring-ass city council meetings way more entertaining.

You can expect 2 things from GQ's Men of the Year party -- TONS of celebs, and all of them dressed to the nines.

We got a bunch heading into Thursday night's shindig at L.A.'s Chateau Marmont -- from "This is Us" star Justin Hartley and John Legend to Kate Beckinsale and Machine Gun Kelly.

Pics from inside the bash are crazy too ... Snoop, Kid Ink, Terry Crews, Matthew Broderick, Wiz Khalifa, and Jesse Williams are just some of the others who cleaned up for the party.

Conor McGregor fueled Rita Ora dating rumors on Wednesday night ... shouting her out at the club while patting his heart BEFORE showing love to his baby mama, Dee Devlin.

C'mon bro ...

Remember, it was just a few days ago Conor was hanging out with Ora at the British Fashion Awards. She posted pics of the 2 of them together with the caption, "Date night."

Fast-forward to Wednesday night at Cirque le Soir in London ... where The Notorious was out with his bros, letting loose on the dance floor to The Notorious B.I.G.

Conor hopped on the mic and said, "What's up, Rita Ora!" ... and then put his hand over his heart.

Moments later, he shouted out Dee ... but no heart gesture that time.

McGregor's probably just trolling (since that's what he does) -- but he and Rita did look awful cozy Monday night ...

No job? No problem!

Johnny Manziel is still living VERY large -- despite the fact he hasn't had an NFL paycheck in a very long time.

The embattled QB pulled up Wednesday to Barneys in Beverly Hills -- one of the most expensive stores in town -- in the driver's seat of a custom Rolls-Royce.

Later that night, he hit up Warwick in a Givenchy sweatshirt, which retails for more than $1,000.

He's also planning a wedding, renting expensive places to live and traveling. So, the question is ... how can he still afford to live so lavishly?

The answer? Manziel is said to have raked in about $7.8 mil from his rookie deal with the Cleveland Browns -- plus, he made a ton of cash from endorsement deals with companies like Nike and Snickers.

Plus, the family reportedly has oil money -- though it's unclear if Manziel has access to it.

The Minnesota Timberwolves still had so much energy left after beating up on the Clippers Wednesday night, they hit the Hollywood club scene after the game ... and TMZ Sports has the video.

Karl-Anthony Towns and Taj Gibson hit up Warwick nightclub looking relaxed after the 112-106 victory over L.A. Towns had 21 points, Taj had 16.

They weren't the only big stars in the club -- Johnny Manziel also rolled through Warwick on Wednesday.

Fun Fact: All 3 guys rocked designer hoodies to the club -- and get this, Taj's Gucci sweatshirt ain't cheap ... $1,280 on the Gucci website!!!

Here's former baseball star Sammy Sosa keepin' things light at a huge festival in Miami Beach.

Sosa hit up DuJour's Miami Beach's Art Basel Kick-Off at The Confidante where he posed for pics on his way into the event ... weeks after T.I. blasted him for his alleged skin bleaching.

Sammy's complexion has very obviously changed over the years. We can only find one interview where he addressed it -- from 2009 -- saying the lightening was an unexpected result of a skin softening cream.

T.I. called B.S. and said it was more about "self-hate" -- but, judging by the way Sammy was smiling and laughing on the red carpet, he really doesn't seem to care what anyone else thinks.

If ya want some California love from Tupac Shakur, it's about to go on sale -- a full frontal shot of the rap legend dropping trou.

The photo was taken in the middle of a 1990 house party in Marin County. We're told Pac would frequently try to shock his pals by exposing his twig, berries and the vast surrounding shrubbery. Hey, it was a much different time.

This particular night ... we're told Pac's gf at the time threatened to snap a photo if he didn't cover up. Of course, he didn't back down, and the d**k pic was born.

We're told the ex wants to privately sell it for $7,500. A rock 'n' roll auction house is accepting offers, but if she can't get the asking price, the woman plans to let it go to the highest bidder.

There are other party pics she's planning to sell, but Tupac's fully clothed. Save your scratch for the big show ... we ain't mad at cha.

Conor McGregor mingled with a lot of huge celebs at London's Fashion Awards on Monday night -- including Rita Ora, who shared photos of her and the UFC mega-star with the caption: "Date night."

The Irish fighter and British pop singer were hangin' for most of the ceremony ... seated together at a table with F1 superstar Lewis Hamilton and supermodels Irina Shayk and Jourdan Dunn.

Before you freak out -- Conor just had a kid with longtime girlfriend Dee Devlin ... and Rita's rumored to be dating musician Andrew Watt.

Still ... that didn't stop the haters from coming after Ora -- including Conor's BFF Artem Lobov, who said, "Sorry Rita, burgers are nice but not when a man has steak at home."

Boosie Badazz just earned himself Father of the Year honors ... from his daughter, anyway.

The rapper gave Ivi a sick Porsche Panamera on Sunday for her 16th birthday. He posted this video the night he surprised her ... and ya can't blame her for losing it. The Panamera's an expensive gift -- around $100k -- especially one that's loaded like Ivi's whip.

Sweet gift for sure, but we think Boosie's gonna regret it. He's got 8 kids ... so, that's a high-priced bar he just set.

The woman who called 911 from French Montana's birthday party claimed someone loaded her up with drugs, then tossed her out of the house naked, but her biggest concern seemed to be getting out of Calabasas.

TMZ obtained the call placed last month from French's crib, where his 33rd birthday celebration went into the wee hours. The woman struggled to provide details ... first claiming to be in Beverly Hills, then telling the 911 operator she was texting photos. The poor operator had to tell the caller, several times, you can't send pics, ma'am.

When asked what's around her, all she could say was, "Calabasas."

The caller did drop some outrageous allegations -- claiming she'd been raped and punched. Law enforcement sources tell us responding cops found no evidence to support the allegations and made no arrests. They did find 2 women who'd been fighting and, as we reported, told them to leave.

The full call goes nearly 10 minutes, and you can click here to hear it.

Astros pitcher Dallas Keuchel has proof that a good time can cost you ... he tells TMZ Sports that the walking boot on his foot is a result of the raucous Astros victory parade.

We got DK leaving Catch LA and asked him what's with the new footwear, since we weren't aware of any injuries he got during the World Series.

That's when Keuchel told us ... he actually hurt his paw after he slipped during the festivities celebrating the Astros first ever MLB championship.