Stars In Heat

It's been 14 years since "My Best Friend's Wedding," but Dermot Mulroney proved he's still got the bod of a newlywed by going on a shirtless run and showing off his buff chest and abs in Santa Monica this weekend.

Trading her meat dress for a wet suit, Lady Gaga followed in Lindsay Lohan's footsteps and went surfing in Mexico on Tuesday.

Gaga stripped down to a bikini and was actually able to stand up on the surfboard.

Wearing a form-fitting green one-piece bathing suit, "Law & Order: SVU" star Mariska Hargitay cooled off in the Hamptons on Wednesday.

Life's a beach for Detective Benson.

Lindsay Lohan once again had trouble getting up on her two feet ... but this time she was surfing.

With a full face of makeup, Linds got up on one leg and a knee while maneuvering the waves in Malibu on Tuesday.

Arnold Schwarzenegger's love child Joseph Baena hit the Malibu surf for some boogie boarding ... less than a month after Arnold's other 13-year-old son Christopher seriously injured himself doing the same thing.

A day after going topless, supermodel/mother of four Heidi Klum celebrated covering up on the beach by chugging down a Corona in Italy on Monday.

So that's how she keeps her sexy girlish figure.

An ecstatic Heidi Klum let it all hang out in Sardinia, Italy this weekend by going topless on the beach.

Gorgeous and ageless Halle Berry celebrated her 45th birthday (FORTY-FIFTH!) by taking a stroll on the beach in Malibu with her girls ... and her baby girl Nahla this weekend.

The woman gets hotter and hotter every year.

Brooke Burke hit a real sticking point on her vacation today in St. Barts -- emerging from the warm Caribbean waters in her painted-on teal bikini.

Looking like the hottest American Gladiator ever, AnnaLynne McCord rocked elbow and knee pads with her green bikini to shoot some sort of ridiculous sexy jousting scene on "90210" in L.A. yesterday.

David Beckham & Cristiano Ronaldo be damned ... because Argentinian soccer stud Lionel Messi has been called the best soccer player in the world ... and he just may have the best body too.

The 24-year-old FC Barcelona star showed off his toned, hairless physique -- and his tan line -- while on a yacht in Ibiza on Tuesday.

Supermodel Alessandra Ambrosio stripped off her pesky life vest to reveal her sexy, taut bikini body in Maui on Monday.

With her smokin' hot physique, the 30-year-old can resuscitate anyone.

Some of Hollywood's hottest bodies always make it to the beach in a one-piece, while others like to let it all hang out and go two-pieces.