Star Tracks: Friday, March 25, 2011

The singer celebrates turning 36 by partying in Las Vegas. Plus: Justin Timberlake, Gwyneth Paltrow and more

01 of 16

Swinging Star

Swinging Star
Denise Truscello/WireImage

Fergie and husband Josh Duhamel celebrated her 36th birthday with dinner before she hit The Bank Nightclub at Las Vegas's Bellagio, where fans sang "Happy Birthday" and she sang the Black Eyed Peas' "Imma Bee" – for starters.

02 of 16

CALIFORNIA GURL

CALIFORNIA GURL
Flynet

Looks like the Gossip Girl gang is taking a jaunt out West! A beaming Blake Lively returns to her native La-La land to film sun-drenched scenes for the CW drama on Thursday.

03 of 16

STAR HOMECOMING

STAR HOMECOMING
Frank Micelotta/Fox/PictureGroup

It's a trip down memory lane for Jennifer Hudson, who returns to the American Idol stage for a performance on Thursday night's elimination show in Los Angeles.

04 of 16

EARLY RISER

EARLY RISER
Doug Meszler/Splash News Online

Bradley Cooper makes a dashing exit after an appearance on the Today show in New York's Rockefeller Center on Thursday.

05 of 16

DRESS UP

DRESS UP
Kevan Brooks/AdMedia

Modern day Material Girl Kelly Osbourne plays mix and match in a dotted tube top, on-trend floral mini and cropped denim at the launch of the Madonna-helmed fashion line at the Macy's in Beverly Hills on Thursday.

06 of 16

SHADES OF GRAY

SHADES OF GRAY
Norman Scott/Startraks

A smartly clad Ryan Phillippe leaves his baby mama drama and current gal pal Amanda Seyfried out of the picture on Thursday while heading to dinner in L.A.

07 of 16

ALL IN THE FAMILY

ALL IN THE FAMILY
Bruce Glikas/FilmMagic

Proud parents Bruce Willis and Demi Moore reunite to support daughter Rumer's debut in the Broadway production of Love, Loss and What I Wore in New York City on Thursday.

08 of 16

ANIMAL INSTINCTS

ANIMAL INSTINCTS
Ramey

Who's hungry? A formal Alec Baldwin plays nice with a local law enforcement equine – and offers a healthy snack! – while shooting a commercial Thursday in New York City.

09 of 16

ALL IN STRIDE

ALL IN STRIDE
X17

After hanging with Sandra Bullock in New York, Renée Zellweger returns home to L.A. Thursday, where the newly single star stepped out with a smile.

10 of 16

GEE WHIZ!

GEE WHIZ!
PPNY/GSNY/Splash News Online

Mom-to-be Natalie Portman keeps her baby bump bundled while walking her Yorkie Whiz in New York on Thursday.

11 of 16

FAN- DEMONIUM

FAN- DEMONIUM
Barcroft/Fame

He's a crowd pleaser! Hugh Jackman gets a fan-frenzied reception Thursday at Mumbai International Airport in India, where he's set to speak about the film industry at the FICCI Frames conference.

12 of 16

SWING SHIFT

SWING SHIFT
NICE/AKM

Whee! An expectant Jessica Alba helps 2-year-old daughter Honor catch some air Thursday during a mommy-and-me playdate at Beverly Hills's Coldwater Park.

13 of 16

ANIMAL INSTINCTS

ANIMAL INSTINCTS
Flynet

Brrr! Mary-Kate Olsen bundles up in another fur-rocious getup while braving the Big Apple chill on Thursday.

14 of 16

FASHION FIX

FASHION FIX
JOhn MacDougal/AFP/Getty

"Grenade" singer Bruno Mars channels his inner Rat Pack-er while stylishly arriving for the 2011 ECHO Awards in Berlin on Thursday.

15 of 16

PEEK-A-BUMP

PEEK-A-BUMP
Flynet

Though she's not due until later this year, mom-to-be Alicia Silverstone flaunts her belly as she heads into a yoga class Thursday in West Hollywood.

16 of 16

PLANET GAGA

PLANET GAGA
X17

Lady Gaga gives Las Vegas party-goers the surprise of a lifetime on Thursday, delighting revelers at Krave nightclub in Planet Hollywood with an impromptu performance.

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