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Simon Cowell dusted off his "Mr. Nasty" crown, making it clear Tom Sandoval -- AKA "the Most Hated Man in America" -- wasn’t about to charm his way to a win on his watch!

The Brit went full savage on the former "Vanderpump Rules" star and his band The Most Extras -- torching their pitchy jazz-rock take on The Weeknd’s "Blinding Lights" during Tuesday’s "America’s Got Talent."

Simon hated it so much he was the lone judge to slam his X buzzer ... then bluntly told Tom that while he liked him and the band, they just didn’t sound good.

"The Biggest Loser" caffeine feud just got piping hot -- 'cause TMZ scored a peek at the show’s grocery list for contestants ... and surprise, surprise, it’s stacked with caffeinated goodies!

Check the receipts from 2013 -- the list, which we obtained from Jillian Michaels, straight-up name-drops Organic Dark Roast, Starbucks grounds, and a bunch of different teas. The shopping list of "approved foods" for contestants was attached to an email that a show line producer sent to the trainers and other staffers.

Obviously, several of those items totally undercut Dr. Robert Huizenga’s claim to us the show was 100% caffeine-free from day one ... with coffee, diuretics, and weight-loss pills supposedly off-limits.

Jillian Michaels didn't get along with every contestant on "The Biggest Loser" ... but, that doesn't mean she was handing out caffeine pills like a new documentary suggests -- so says one of the OG Losers.

We spoke with David Fioravanti -- a contestant from the first season of the show -- and, he details his contentious relationship with the fitness trainer and former coach on the show.

Fioravanti says he came into the show with a basic level of fitness knowledge ... so, he didn't follow everything Michaels said without question.

Kelly Clarkson’s keeping the show rolling after the tragic death of ex-hubby Brandon Blackstock -- TMZ’s confirmed she’s heading back to "The Voice" as a coach.

We’re told Kelly skipped one taping for Season 29 of NBC’s 'Battle of the Champions' earlier this month -- coming right after the heartbreaking news -- but Jennifer Hudson stepped in during rehearsals for the battle rounds.

Kelly’s reuniting with fellow champ coaches Adam Levine and John Legend -- and get this, the show’s cranking out two cycles at the same time.

Tiffani Thiessen was born January 23, but it'd be hard to tell from her recent video post, where she eats a cake ... apparently wearing nothing but her birthday suit!

The "Saved by the Bell" alum totally teased fans with her recent Instagram post ... appearing topless while enjoying her sweet treat ... and asking fans, "How do you eat it?"

Her caption -- "When it’s hot out, you gotta get naked…" -- made it clear she was commenting on the naked carrot cake instead of her naughty body -- so relax, Mr. Belding!

TV personality Peggy Sulahian was in her mid-40s when she was cast -- and delivered the ever-so-pleasing drama -- on Bravo's hit reality show "The Real Housewives of Orange County" back in 2017.

Joining Peggy included the 'OG of the OC', Vicki Gunvalson -- the insurance company owner and queen of "whoopin' it up," Tamra Judge as the fitness-motivated blonde and Vicki's partner in crime (at the time), and Shannon Beador as the handsy and animated housewife.

Aside from all the tea-spilling, Peggy shared her breast cancer journey on the show.

A Big Brother housemate just served up the sourest move yet -- and trust us, you wouldn’t risk her anywhere near your welcome mat after seeing this!

Catch this clip that was caught on the live feed from "Big Brother" S27 -- housemate Mickey cracks open a fresh bottle of lemonade, chugs straight from the rim ... then pops it right back in the communal fridge like nothing happened.

Total nightmare -- the communal fridge, everyone’s drinks, and not a soul around to catch her in the act ... meaning the house had no clue Mickey’s germs were already swimming in their lemonade!

Honey Boo Boo's ready to hop back in front of the camera ... sitting down to film a new season of Mama June's reality show with her man!

The reality star -- real name Alana Thompson -- was spotted in the Denver, Colorado area at Sloan's Lake Park Saturday afternoon ... sitting on the grass with her beau, Dralin Carswell.

The two seem to be relaxing ... milling about the park and having a few snacks while dudes with radios get ready to start rolling the cameras.

Tracee Ellis Ross is heating up the 'gram with her latest steamy bikini shots.

Check out the actress's stunning Instagram post from Friday ... she's showing off her curves and toned torso in a black bikini while posing poolside at a beautiful waterfront location.

She's got plenty of thirst traps ... showing off her sun-kissed skin in a variety of poses around the picturesque spot.

Tristan Rogers -- an actor known for his work in soap operas and animation -- has died ... according to a report.

ABC7 Los Angeles -- citing Rogers' longtime manager, Meryl Soodak -- reports Rogers passed away Friday morning after a long battle with lung cancer. Despite the cause of death, Soodak told the outlet Rogers didn't smoke.

Rogers got his start in acting way back in the late 1960s with an appearance on the Australian science-fiction adventure series "Delta."

American actress and beauty pageant title-holder Mary-Margaret Humes was in her mid 40s when she played Gale Leery -- Dawson's mother and the wife of Mitch Leery -- on the popular TV show "Dawson's Creek" (back in the 90s-early 2000s).

Humes was part of an ensemble cast including James Van Der Beek as the aspiring filmmaker who looks up to Steven Spielberg, Dawson, Joshua Jackson as the sarcastic, unmotivated teen struggling with his home life, Pacey, and Katie Holmes as the tomboy whose mother died of cancer, Joey.

Mary-Margaret was Miss Florida USA in 1975 and third runner-up at the 1975 Miss USA pageant.

"Love Island USA" season 7 winners -- Amaya Espinal and Bryan Arenales -- are soaking in all the love and support after ending their time in the villa, winning $100K and the hearts of America.

We caught up with Amaya and Bryan separately in NYC -- just a day after filming the 12-hour Love Island reunion -- and while they kept it cute on spoilers, they did tease what fans can expect when the post-villa drama hits screens regarding their own relationship.

This season's stars have been seen happier than ever in the outside world lately, and Bryan is all smiles, praising their life away from cameras -- telling us everything is "going great" and that we can look forward to seeing their strong connection during the reunion.

Michael Theo might be breaking a lot of hearts with his announcements ... 'cause he says "Love on the Spectrum: Australia" won't be getting a third season -- and, he's off the dating market too!

We caught up with the star of the series -- which actually debuted before its American counterpart -- on our "Big Down Under" podcast ... and, he revealed he's dating someone new, but people won't see it play out on television 'cause the show's not coming back.

Theo doesn't give a reason for the cancelation ... but, he seems at peace with it -- frankly telling us that chapter of his life is closed now.

Kris Jenner is launching a new production company ... and interestingly, she's keeping "Kardashian" out of the name.

Here's the deal ... in a new trademark filing -- obtained by TMZ -- Kris' company Jenner Communications Inc. has filed for a new mark ... Kris Jenner Productions.

It seems Kris could have some new television shows in the works ... the trademark covers producing and developing TV programming, creating content for the internet, and other entertainment services tied to pop culture.

Huda Mustafa just scored the ultimate revenge glow-up ... courtesy of Chris Appleton, AKA the Reinvention King, the man behind major A-list stars' most iconic hair moments.

Seemingly for the reunion show, Huda ditched her signature down-do for the first time ever -- rocking a sultry updo with bold, faux bangs that completely redefined her look.

Appleton -- known for pushing the limits of beauty transformations with stars such as Kim Kardashian, Jennifer Lopez, and Dua Lipa -- crafted the style to spotlight Huda's striking features ... and the results scream A-list energy.

Taylor Swift has drawn plenty of criticism and insults from Donald Trump in the past -- and now Jimmy Fallon’s spinning her material to roast the Commander-in-Chief ahead of his Friday summit in Alaska with Russian President Vladimir Putin.

It was pure comedy gold -- Jimmy went full Swiftie on Wednesday's 'The Tonight Show,' belting lines like, "For a long time Trump looked at Putin and thought, 'You Belong With Me,' and when the people warned him to steer clear, he would just 'Shake It Off.'"

The hits kept coming -- like how Americans worry Trump isn’t serious about negotiating for peace in Ukraine … "because his brain is basically one giant 'Blank Space.'"