Star Tracks: Thursday, March 25, 2010

01 of 14

SHARP DRESSER

Sporting a spiked letterman jacket and leopard tights, Lady Gaga arrives in style for her Melbourne concert Wednesday. The singer is touring Australia with her Monster Ball tour.

02 of 14

DOUBLE SCOOP

How cute! Jennifer Garner gets the mother of all workouts, toting daughters Violet, 4, and Seraphina, 1, in Pacific Palisades, Calif., Wednesday.

03 of 14

DISNEY DUET

Joe Jonas and girlfriend Demi Lovato, dubbed by fans, hug it out after performing their duet "Make a Wave" Wednesday on American Idol in Los Angeles. Host Ryan Seacrest cracked afterwards: "Good chemistry on the stage between these two, wouldn't you say?"

04 of 14

GET A GRIP

Vanessa Hudgens and Zac Efron enjoy each other's company during a casual shopping trip at California's Malibu Lumber Yard Wednesday.

05 of 14

STICKING TOGETHER?

One day after bowling with Glee's Cory Monteith (not pictured), Taylor Swift reunites with rumored ex Taylor Lautner for lunch at Beverly Hills restaurant the Farm Wednesday.

06 of 14

THE RIGHT PATH

The Hills may be ending its run on MTV, but Audrina Patridge couldn't be happier after lunching new love Ryan Cabrera in Los Feliz, Calif., Wednesday.

07 of 14

WET & WILD

Also Down Under: Ke$ha cools off at Bondi Beach in Sydney Wednesday on a break from promoting her debut album, Animal. The singer also Tweeted that she had "so much fun w the koalaz and snakesss."

08 of 14

SIGNING OFF

ERIN ANDREWS & MAKSIM CHMERKOVSKIY — MAXA/Landov

Dancing with the Stars partners Maksim Chmerkovskiy and Erin Andrews send the right message after finishing dance practice in L.A. Wednesday.

09 of 14

HAT STUFF

Nicole Richie, who says she's ready to plan her wedding to rocker Joel Madden, takes cover with a black hat and oversized sunglasses Wednesday while running errands in Los Angeles.

10 of 14

WELL-HEELED

It's a girl's paradise! Kim Kardashian – who's laying low in Miami after from her relationship with Reggie Bush – celebrates the one-year anniversary of ShoeDazzle.com on Wednesday.

11 of 14

BALL BOY

Mike "The Situation" Sorrentino brings his buff biceps to the baseball diamond Wednesday, tossing out the first pitch before a New York Mets spring training baseball game in Port. St. Lucie, Fla.

12 of 14

THE IN CROWD

Real Housewives of New York City power pair Jill and Bobby Zarin ditch the drama for some fun Tuesday night at the opening party for Manhattan nightclub The Collective.

13 of 14

MELLOW YELLOW

Shear Genius host Camila Alves leaves beau Matthew McConaughey and their kiddies behind on Wednesday to attend the launch of Pinko's new clothing line in Barcelona, Spain.

14 of 14

'BIG BANG' THEORY

Maggie Gyllenhaal puts the squeeze on her Nanny McPhee and the Big Bang costar Emma Thompson Wednesday during the premiere of their new family comedy at London's Odeon West End Cinema.