Stars In Heat

Less than a year after gaining 30 pounds, Lady Gaga is back down to her fighting weight -- surfacing south of the border in Mexico this week with some friends ... in a sexy floral bikini.

You'll recall, Gaga struggled with her weight last year, telling Stylist Magazine, "I don't really care if [people] think I'm fat, because, quite honestly, I did gain about 30 pounds."

Gaga also underwent serious hip surgery a few months ago ... so that probably helped with the weight loss too.

This smokin' hot celebrity butt was spotted at a pool in L.A. this weekend ... but the question is -- WHOSE ASS IS IT???

Here's a tip ... she used to bang a SUPER famous person ... and then moved on to a not-as-famous person.

Kristin Cavallari took the easiest path to a slamming bikini-ready ass -- date Jay Cutler, get dumped, get pregnant with his baby, and then ... BAM! Instant booty. Simple.

It's only been 10 months since Kristin Cavallari popped out her kid ... and she's already snapped back into bikini shape.

The 26-year-old former MTV star -- who's engaged to perennially injured Chicago Bears QB Jay Cutler -- gave birth to their son Camden Jack last August.

Polish supermodel Joanna Krupa wants to show the entire world the two perky reasons why everyone should be watching "Real Housewives of Miami."

With the heat in Florida just too much for her beautiful supple skin to bear, the 34-year-old former not hooker "Dancing with the Stars" contestant set her gorgeous gals free and sunbathed topless on Friday.

But Joanna and the twins were not alone, as her lucky ass fiancé Romain supervised the entire accidentally on purpose -- but amazing -- photo op.

Despite all the hype, soccer stud Cristiano Ronaldo really does measure up.

Even though he already looks like a perfectly sculpted plastic sculpture, the 28-year-old Portuguese futbol sensation showed off his entirely hairless, buff bod by rolling up his shorts and going shirtless in order to get properly fitted for his latest waxen statue in Madrid on Thursday.

We're told the human Ken doll has an amazing 43 inch chest, a beautiful 33 inch waist, a pair of glorious 24.3 inch thighs, heavenly 13 inch (unflexed) upper arms and a rock hard 11.8 inch ... forearm.

Size does matter.

While swimming near the shore in Miami, Victoria's Secret supermodel Candice Swanepoel's bikini was nearly swallowed up ... by her own amazing ass.

With her heavenly yellow bikini bottom fighting to stay afloat, the 24-year-old South African stunner soaked her gorgeous curves in the warm waters of South Beach this weekend.

Luckily no one drowned ... watching Candice come out of the water.

Smokin' hot actress Olivia Wilde is board with Jason Sudeikis.

The 29-year-old "Cowboys & Aliens" star flaunted her taut tummy in a black bikini while paddle boarding around the beach in Hawaii with her shirtless "Saturday Night Live" fiance this holiday weekend.

While Olivia looked amazing in her swimsuit, the 37-year-old funnyman proved his hairy slender torso was nothing to laugh at either.

Although they haven't revealed their wedding date, Olivia and Jason are making sure their relationship is as fit as can be.

Before you enjoy the long Memorial Day weekend with the sea, pools and the sun ... take some time to remember how Hollywood's 1% enjoy those same outdoor activities all the time.

Daniel Day Lewis -- 3 Oscars for Best Actor.

Leonardo DiCaprio -- 0 Oscars ... and a yacht filled with gorgeous, half-naked women frolicking around the South of France this week.

Leo wins. Again.

Besides having tons of money, a ridiculously rich husband and a sick Malibu mansion, "Real Housewives of Beverly Hills" star Yolanda Foster also has a model child.

Yolanda supervised as her gorgeous 17-year-old professional catwalking daughter Gigi Hadid rocked a bikini and a pair of Roman gladiator sandals on a photo shoot in L.A. on Wednesday.

Fun fact: Yolanda is currently married to music mogul David Foster, but Gigi is her daughter with ex-husband Mohamed Hadid ... the celeb real estate contractor who just settled a huge lawsuit with Sylvester Stallone over alleged shoddy home renovations.

Rihanna just gave ex-boyfriend Chris Brown a little taste of what he's missing ... her perfectly sculpted ass.

RiRi just posted an extreme close-up shot of her nearly bare derriere in shorts that are so tiny, her THONG is hanging out of 'em.

Rihanna added a caption saying the pic was from the set of her new music video ... but we think it's pretty obvious the photo was for an audience of 1 -- Chris ... who was recently spotted out with his other sometimes-GF Karrueche Tran (who definitely doesn't have an ass like Ri).

Think he's regretting the breakup yet?

Jason Derulo is jacked!

Proudly showing off his ripped guns in a sweaty tank top, the 23-year-old singer posted a photo of himself hitting the gym bright and early this morning.

Hard to believe it was just a little over a year ago that Jason fractured his neck and was almost paralyzed while rehearsing for a tour.

Dwyane Wade and LeBron James really are gunning for the NBA playoffs.

The massive Miami Heat superstars took time out from practicing for this week's playoffs to show off their rock hard buff shirtless pecs, arms and abs on the beach in Miami this weekend.

Unfortunately, the A-list ballers will have to put on jerseys to battle the Indiana Pacers in Game 1 of the Eastern Conference finals on Wednesday.

As you relax next to your inflatable plastic pool and sip on a wine cooler, guess whose lovely limbs are soaking up the sun in style!

Tiger Woods lost the shirt off his back ... and this time his ex-wife Elin Nordegren had nothing to do with it.

The 37-year-old golf star aired out his man nipples and soaked up the sun by going shirtless on his yacht in Palm Beach on Tuesday.

While his fancy schmancy boat is called Solitude, Tiger spent the afternoon lounging and fishing with his two adorable kids and his sexy bikini-clad girlfriend Lindsey Vonn yesterday.