Dating

Riff Raff tried telling us he was dating Katy Perry months ago and we didn't believe him ... but Sunday night, the two looked like quite the couple -- the key word being ... LOOKED.

Following the VMAs, our photog spotted the happy couple leaving Mastro's wearing matching denim outfits. They were both clearly tipsy and joked about picking baby names.

But when you see the car door close ... and Katy's hand press against the window -- this all starts to look like they're both trying way too hard. It's not that we don't want RR to land a chick like Katy ... it's just that their gushing stinks of a publicity stunt.

Back in March, Riff Raff told us he and Katy were a thing, but check out the other girl in the video ... we assumed he was just kidding. Based on last night's video, we were probably right.

Chris Brown says he's back with Karrueche because she finally realized he did NOT have sex on a St. Tropez yacht.

The on-again-off-again couple is now on again ... and Chris says it's because Karrueche now realizes he was telling her the truth when he said he was not having sex with anyone else.

Sources close to Karrueche tell us ... he was frantically texting and calling her -- more than 20 attempts a day -- to acquit himself, but she ignored him.

We're told Saturday ... Karrueche showed up at Chris' celebrity flag football game to talk it out ... which they did, and she believes him.

As for the whole yacht thing ... there definitely was smoke ... he was on the vessel cavorting with several women, including one of Karrueche's close friends.

Barry White would be proud ... Justin Bieber and Selena Gomez can't get enough of their love -- TMZ has learned they're back on for the umpteenth time.

Sources close to Jelena tell TMZ ... the two are trying to work things out. We're told they even went to church together Wednesday night, and they're "trying to be better people."

Not coincidentally, Bieber posted a Bible verse on Instagram the next day that read, "After you have suffered a little while, God will restore, confirm, strengthen and establish you."

They were also spotted at the movies earlier this week and Justin posted (and quickly deleted) a photo that appeared to show Selena kissing his cheek.

Yes ... we're getting ready for a "Justin and Selena Break Up" story. Again.

U.S. Olympian Joshua Mance's dream of bangin' a porn star could still be alive -- 'cause one of the hottest women in the flesh biz tells TMZ Sports she's willing to give him a shot at her gold medal.

We shot Josh a few weeks back, and the Olympic silver medalist made an impassioned plea for us to hook him up with porn star Skin Diamond -- which didn't exactly work out.

But sometimes when one door closes, another hole opens -- because Courtney Taylor tells us she saw our video of Joshua, and thinks ..."He is super cute. I'd be all about that boy."

Courtney -- star of "Art Of Anal 2" and "Interracial Swingers 1" -- says she's ready to introduce Josh to her style of banging, telling us ... "Trust me, he'd love his first porn star experience."

Ball's in your court, Josh ... until Courtney gets a hold of 'em.

Lisa Leslie thinks there's nothing worse than being a little man, but says short guys should go after tall girls anyway ... just not her.

Leslie was doing a little food shopping Wednesday in Calabasas when our photog asked her if she had any advice for all the short guys trying to get with tall chicks.

Chrystal Workman continues making shocking claims in her bid to undo the court ruling that stripped her of custody of her daughter, Ariel Winter ... now she's raising strange allegations of sexual molestation.

Workman filed legal docs, obtained by TMZ, in which she claims her 15-year-old daughter has accused her of "sexual abuse or sexual molestation." Workman says, "I adamantly deny these accusations."

Here's the problem ... The "Modern Family" star has never hinted at sexual molestation in her guardianship case. She has only alleged physical and emotional abuse, so it's confounding as to why Workman is denying something that was never raised in court.

It's possible Workman is inartfully referring to an allegation by Ariel's boyfriend, Cameron Palatas, who said in his deposition, "Chrystal had wanted me to sleep in Ariel's bed." Palatas was an adult at the time.

'Real Housewives' star Adrienne Maloof goes through men faster than chili fries -- because right after we saw her spat with one much younger bf, she found herself a brand new ... much younger bf!

Cougars gotta eat.

It's great to be Adrien Brody.

The star of "The Pianist" was drowning in a sea of female flesh this weekend when he and hot girlfriend Lara Leito hit up a Turkish nightclub in Istanbul ... and couldn't resist the undulating charms of half-naked belly dancers who lured them onto the dance floor.

Brody's belly stayed hidden, however... he kept his clothes on.

Good news, single heterosexual men and/or lesbians: Eva Longoria (the sexiest 38-year-old woman on Earth) is now officially single.

Sources tell TMZ, the former "Desperate Housewives" star split from boyfriend Ernesto Arguello this week after dating for roughly 4 months.

The two met while Longoria was producing her dating show "Ready for Love." Ernesto was a bachelor on the program, but after the show went off the air, Eva decided to take Ernesto for herself.

Eva and Ernesto were spotted canoodling in Spain as recently as two weeks ago (above), but once they got back to L.A., we're told they decided their busy lifestyles just didn't mesh.

Eva spends most of her time in L.A., and Ernesto is situated primarily in Miami, so they decided it would be better to split. But some sources aren't convinced it's completely over -- as one source put it, "They're just on hold right now."

Translation: if you want to scoop Eva up, you better act fast.

Melanie Griffith brought a very interesting date to the premiere of her movie "Dark Tourist" this week -- her ex-husband Steven Bauer ... a guy she's BARELY been seen in public with since they divorced more than 20 years ago, TMZ has learned.

Griffith and Bauer (who famously starred in "Scarface" back in 1983) were all over each other on the red carpet ... which raised eyebrows considering Melanie's current husband, Antonio Banderas, was no where to be found.

According to our crack research team, the last time M & S were photographed on a red carpet together was back 1985 ... back when Ronald Reagan was President.

There have been rumors that Melanie and Antonio have been going through a rough patch ... which makes her decision to walk her ex down the red carpet even more curious.

Sources close to the couple tell TMZ ... despite divorcing in 1987, Melanie and Steven have remained close over the years and have worked together to co-parent their son Alexander Bauer, who also attended the premiere.

We reached out to Melanie's people -- but didn't hear anything back.

Sure, Leo DiCaprio might look goofy on the tennis court ... but he doesn't care. Know why?

'Cause his tennis partner is Toni Garrn ... who happens to be a smokin' hot Victoria Secret model ... who Leo probably had sex with after the tennis match on Mallorca.

Advantage: Leo.

Always.

Here comes the bride ... to-be ... at least, that's the way it seemed when Hayden Panettiere arrived to LAX yesterday with a HUGE DIAMOND on her finger.

Rumors have been swirling that the "Nashville" star finally said "Yes" to her massive heavyweight boyfriend Wladimir Klitschko ... but that bling on her hand pretty much put the rumors to bed.

So ... CONGRATS!!!!

Hayden was in a great mood on her way out of the airport yesterday (as usual) -- and there was only one topic to discuss ... weddings! Though it's unclear if she was referencing her own.

Check out the clip.

Simon Cowell's ex-fiancée is doing something rarely seen in Hollywood -- treating his baby news like a bonafide adult because she's actually HAPPY for him ... sources tell TMZ.

After news broke Cowell knocked up Lauren Silverman ... it was reported that his ex-fiancée of two years Mezhgan Hussainy was devastated, thinking it should have been her.

Sources close to Mezhgan tell us, that couldn't be further from the truth. She and Simon have remained close since their split -- they're good friends and talk almost every day.

In fact, Simon told Mezhgan about the baby weeks ago -- and she immediately called Lauren, who she's also friends with, to offer her congrats and support ... knowing how stressful the media attention can be.

Bottom line: she's thrilled for the couple. As long as Simon's happy, she's happy.

That was fast ... Joan Collins has successfully convinced Shirley Jones' publisher that she did NOT nearly have a 4-way orgy with Shirley and their two husbands back in the ''60s -- despite claims in Shirley's new book -- and now, the publisher has agreed to yank the story.

As we reported, Shirley's new book "Shirley Jones: A Memoir" recounts a story about a sex party that nearly went down at Joan Collins' house back in the day -- involving Joan, Shirley, Shirley's husband Jack Cassidy, and Joan's husband Tony Newley.

In the book, Shirley says she declined the orgy invitation ... but Joan says the entire story is bogus, start to finish.

Joan sent Shirley's publisher Simon & Schuster a cease and desist letter after the book was published, demanding a retraction -- and we've learned, both Shirley and the publisher caved ... agreeing to remove Joan's name from the book.

Joan's rep tells us, S&S has agreed to remove Joan's name from Shirley's e-book immediately, as well as in future reprints. As for the books already on shelves, Joan is out of luck.

Emma Roberts is an adult who can take care of herself -- so says the actress' dad Eric Roberts, who tells TMZ, he supports Emma's decision to stay with her BF following her domestic violence arrest this month.

As we reported, Emma was arrested in Montreal July 7th for attacking her boyfriend Evan Peters inside their hotel room, allegedly biting him and even giving him a bloody nose. Emma was eventually released because Evan didn't want to press charges. The two are still together.

But the question: how does Emma's dad feel about that? We asked and he said Emma is a grown-up who can make her own decisions ... as well as her own mistakes, and learn from them. Wise words.

But you've gotta see Eric's reaction to the obvious follow-up question -- would he support Emma MARRYING Evan?

It's a showdown of Selena Gomez' prior suitors.

Here's a topless photo that 20-year-old Nick Jonas shared on his social media page (left) -- and an equally skin-filled photo 19-year-old Justin Bieber posted on his (right).