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Jennifer Aniston is one step away from a wet t-shirt contest.

The 47-year-old actress was rocking a white shirt and bottled water Thursday while cruising around NYC.

For any doubters it's Sia actually singing under that mop of hair ... a Rocky Mountain breeze has your back.

Sia was performing Wednesday night at Red Rocks Amphitheatre in Denver, Colorado when the weather refused to cooperate. The famed amphitheater is carved into the foothills of The Rockies, so the wind gets tricky.

The singer's been spotted without her wig before, but her face is always covered when she's performing, so count this as a cheap thrill for the crowd.

Portions of Omar Mateen's alleged hookup with at least one gay man were captured on surveillance cameras at an Orlando hotel ... TMZ has learned.

Sources at the Ambassador Hotel tell TMZ, Mateen was seen on camera footage recorded December 14, 2015 around 11 PM. We're told the video bolsters the claims of the heavily disguised man who told Univision he met up with Mateen 15-20 times at the hotel between November and December.

Our sources say the video shows Mateen walk to the front desk, speak to a staffer and then walk around a corner toward the room where the anonymous man says he was staying during their rendezvous.

We're told management showed the video to staffers and asked if anyone recalled seeing Mateen. The only person who noticed him is a guy who works the night shift.

We're told the FBI went to the Ambassador Tuesday night and took a copy of the surveillance footage.

The Bureau wouldn't confirm, but the video could go a long way to figuring out if Mateen attacked a gay club as part of a twisted revenge plot.

Nick Cannon took it back to the motherland Wednesday night for dinner.

Nick was reppin' for Africa in a gray turban to match his jacket, and an Egyptian amulet around his neck ... on his way out of Nobu in Malibu.

Kendall Jenner was chillin' like a villain and stealing the spotlight in the process.

Kendall, Gigi Hadid and Hailey Baldwin went for a stroll Tuesday in NYC ... and the view was piercing.

The good news ... Kendall doesn't need a guy to put a ring on it.

Lindsay Lohan's got a good eye ... first bagging a rich Russian and now chillin' on an exotic island.

Lindsay and fiance Egor Tarabasov vacayed on the Mauritius Island ... surrounded by turquoise waters and a pretty damn cool rock island.

Who's laughing now?

Nick Young pulled up at the house he and Iggy Azalea used to share looking pretty down in the mouth, but it's not because he's gotta pack ... turns out he's not going anywhere.

Shortly after he arrived home Tuesday afternoon, Iggy tweeted ... "The home belongs to Nick. I am the one moving."

It now appears most of that stuff out on their driveway might be hers -- or maybe they're just making piles to separate their stuff.

Breaking up is hard to do ... especially the packing part.

Rosie O'Donnell and daughter Chelsea have buried the hatchet ... or so it seems after they were pictured together smiling -- for the first time in over a year.

Rosie and her daughters, Chelsea and Vivienne, were spotted Monday aboard the SS Hornblower cruise ship for a cancer benefit in NYC ... and as you can see, Rosie and Chelsea appear in MUCH better spirits after spending much of last year on the outs.

As TMZ reported ... Rosie called the cops claiming Chelsea was off her meds and had run away with a dude who'd been convicted on drug charges -- before taking off again to be with her birth mother. Shortly after that, Chelsea went to the media, saying she "did not love Rosie."

Time heals?

Iggy Azalea has gone country ... as in a country song where a scorned woman throws her ex's junk out the second floor window onto the lawn.

Iggy deposited Nick Young's worldly belongings in her driveway Monday ... this after having flatbedded the '62 Impala she gave him as a gift to parts unknown.

She's put him on blast, saying she can't trust him anymore after the whole cheating thing.

Nick needs a new ladder.

Beyonce's working with sour accessories in Hawaii ... call it a sweet marketing ploy.

Bey and Jay Z are currently enjoying paradise beachside. Check out the pics ... Beyonce traded diamonds for a lemon rope. She's definitely got "Lemonade" on her mind ... in case that crown wasn't a dead giveaway.

Kesha slipped into a little black bikini for a desert vacay with her longtime boyfriend.

The singer was poolside in Palm Springs over the weekend. She and writer Brad Ashenfelter did their best to stay cool in the triple digit temperatures.

Check out the gallery to see the awesome bonus they got ... from a masseuse!

Victoria's Secret model Izabel Goulart rinsing off on a beach in Ibiza is a sight to behold ... until her boyfriend swoops in and ruins it.

Izabel -- who's got a role in "Baywatch" -- is dating German soccer player Kevin Trapp.

Taylor Swift is clearly on cloud 9 with Tom Hiddleston.

No doubt anymore about their relationship ... they left Taylor's Rhode Island home and boarded her private jet for parts unknown.

A month before splitting with Calvin, Taylor Swift had eyes for Tom Hiddleston ... or so it seems.

Check out this pic, taken May 1st, at the end of a pre-Met Gala dinner at Anna Wintour's house. Tay seems to be peering in the direction of an unsuspecting Tom, who's jawboning with Idris Elba.

Tom did a radio interview not too long ago (above) where he strongly suggests Taylor made the first move ... at the May 2nd Met Gala.

As we reported, we're told Calvin believes his ex and Tom were together weeks before they called it quits on June 1st.

Miley Cyrus is a serious triple threat ... just check out the merch.

Miley was all smiles with Liam Hemsworth Tuesday night in NYC. It's easy to see why she's got a wide grin ... she's got her man, a HUGE rock and dough pouring out of her purse.

Get it, Miley.

Ariel Winter and Elle Fanning popped in blue and bid adieu to their high school daze.

The actresses grabbed their diplomas Monday at Disney Concert Hall in downtown L.A. They joined a long list of famous alumni from their school, Campbell Hall ... including the Olsen twins.