Michael Buble's GF -- Backside Bikini Babe

After taking in the sight of his hot Argentine model girlfriend Luisana Lopilato in a bikini, Michael Bublé cooled himself off in the waters of Perth, Australia on Thursday.

The 35-year-old singer is speechless.

Brooke Mueller -- Flaunting Child Custody

Just hours after Brooke Mueller backed out of a custody agreement with Charlie Sheen, the actor's estranged wife took their twin boys out to dinner last night at a place where everyone could see them.

Brooke -- along with her twins Bob and Max -- hit up Johnny Rockets at The Grove in L.A. -- a place popular with stars and the paparazzi -- where they dined on french fries and other '50s-inspired cuisine.

As TMZ first reported, Mueller called off the custody deal yesterday because Charlie blabbed about the terms to the media.

Christina Aguilera -- I'm Ready for My Close Up!

For the first time since her booze-fueled arrest, Christina Aguilera was spotted out in public yesterday -- looking like she finally shook that hangover.

Cameras snapped away as Xtina -- sporting a bathrobe -- exited Smashbox Studios in Culver City, CA ... a popular place for photo shoots.

As TMZ first reported, Aguilera and her BF Matthew Rutler were arrested Tuesday morning when cops determined Rutler was driving under the influence .. and Xtina was too hammered to take care of herself.

Officials say they will not pursue charges against the singer.

Penelope Cruz -- How to Lose Baby Weight in 32 Days

Just 32 days after giving birth to her baby son on Jan. 22, new mom Penelope Cruz surfaced in Santa Monica on Wednesday with no signs of any baby weight to lose.

She's one hot mama.

Justin Bieber Shows Off the New 'Do

Hilary Swank Samantha Ronson Emma Watson Justin Bieber took his new haircut out for a stroll in Hollywood on Tuesday.

He's looking trim.

S.I. Swimsuit Cover Model -- Flaunting Hairy Legs

Taking a cue from Mo'Nique, Sports Illustrated cover girl/Cristiano Ronaldo's super hot girlfriend Irina Shayk proudly showed off her sexy hairy legs in L.A. on Tuesday.

This pic is a little fuzzy.

Carmelo Anthony Finally Lands in NYC

Lookin' like 65-million-bucks ... Carmelo Anthony emerged from his NYC hotel this morning ... just hours after the New York Knicks officially announced his arrival to the squad.

Anthony -- who signed a 3-year extension with the Knicks before the trade with Denver was finalized -- is set to make his debut in tonight's game against the Milwaukee Bucks.

The RIDICULOUS House That Jeter Built

Derek Jeter dropped $7 million just for the land to build a nearly 31,000 square foot waterfront mega-home in Tampa ... and it's unbelievable.

The recently completed estate features two 3-car garages, a swimming pool, a billiards room, a memorabilia room, 9 bathrooms and 7 bedrooms for Jeter and girlfriend Minka Kelly to use at their discretion.

Welcome to St. Jetersburg!

Roseanne Barr Bathing Suit Posedown

Roseanne Barr was kickin' it in Maui yesterday when she noticed the paparazzi snapping away ... so she gave 'em exactly what they wanted -- hotness.

Tony Parker -- Three Hot Chicks Are Better Than One

Enjoying the single life, Eva Longoria's ex-husband Tony Parker partied it up with a bevy of beauties at Lavo in Vegas this weekend.

The ladies were all wearing replica Parker jerseys.

They've really got his number.

Richard Simmons Goes Gaga

Looking like a bizarro extra from "Black Swan," eccentric weight loss guru Richard Simmons traded his trademark short-shorts for checkered tights and some frilly Lady Gaga-inspired outfit and accessories.

The 62-year-old was not born this way.

Joe Jonas & Ashley Greene -- Pure Lovers

To celebrate her 24th birthday, "Twilight" hottie Ashley Greene got real cozy with her younger boyfriend Joe Jonas, 21, at PURE in Vegas this weekend.

It may not be his birthday, but it looks like Joe's the one who got the best present.

Britney Spears -- Fry Me

Less than a day after Britney Spears released her video for "Hold It Against Me," the 29-year-old mother of two hit up a drive-thru in Kentwood, Louisiana to celebrate -- and the rest ... well, it's a real mouthful.

Lindsay Lohan -- Late Night Hookup w/ Sam Ronson

Lindsay Lohan had a SUPER-LATE night at a Hollywood hotel -- and she didn't leave alone.

Lohan hit the Roosevelt Hotel around 1:45 AM this morning ... where her ex-GF Samantha Ronson was hanging out.

Just 45 minutes later, the twosome ... who arrived in separate cars ... were seen leaving in the same ride.

Lohan has insisted the two are just good friends ... nothing more, nothing less.

You buyin' it?

UPDATE: Before you answer that last question ... check out what Sam tweeted early this morning.

Gabriel Aubry -- My Wild Life with Nahla

Despite the legal war raging behind-the-scenes ... Halle Berry's baby daddy had a super-cute moment with his daughter Nahla at the L.A. Zoo today.

The day after a judge ruled that Halle could take Nahla to NYC while she shoots her new movie -- Gabriel Aubry got in some quality father-daughter time with the 2-year-old in the company of lions and tigers and bears.

Oh my.

Gwen Stefani Checks Out

For some reason Gwen Stefani roamed the streets of Manhattan on Wednesday in head-to-toe plaid.

Matchy-matchy.