People.com Celebrity Star Tracks: Thursday, December 23, 2010 Hilton plays peekaboo swimsuit in Maui. Plus: Zac Efron, Jennifer & Marc, George Clooney and more By People Staff Published on December 23, 2010 05:00 PM Share Tweet Pin Email 01 of 15 HATS OFF Dave/Splash News Online Peekaboo! Paris Hilton doesn't skimp on sexy swimsuits, hitting the beach Wednesday in an eye-catching one-piece in Maui, Hawaii, where the heiress is vacationing with boyfriend Cy Waits (not pictured). 02 of 15 FOOD RUN Fame Newly single Zac Efron takes his sandwich to go Wednesday, after stopping by a Subway shop in Studio City, Calif. 03 of 15 THREE FOR THE ROAD Flynet After a few days of fun and relaxation Down Under, Nicole Kidman, Keith Urban and daughter Sunday, 2, depart Australia from Sydney Airport Thursday. 04 of 15 TINSEL TOWN Blue Wasp / Splash News Online Looks like Hugh Jackman is all about sparkly, shiny Christmas spirit while shopping at Bunnings Warehouse in Melbourne, Australia, with kids Oscar, 10, and Ava, 5, on Thursday. 05 of 15 RED-Y TO ROLL Splash News Online Rihanna heads home for the holidays, arriving in her native Barbados Thursday sporting festive red and green accessories. 06 of 15 GREEN WITH ENVY Clasos/Splash News Online George Clooney and girlfriend Elisabetta Canalis take a page from Cameron Diaz's holiday play book, vacationing in Los Cabos, Mexico, on Wednesday. 07 of 15 STOCKING STUFFERS Fame Are they picking out Christmas gifts for twins Emme and Max? Jennifer Lopez and Marc Anthony step out for some low-key shopping at Kitson Kids in L.A. on Wednesday. 08 of 15 SKI SEASON Fame Avatar star Zoe Saldana spends some time off the slopes Tuesday, strolling through Aspen, Colo., with her fiancé Keith Britton. 09 of 15 FUN IN THE SUN Flynet Life's a beach for Liev Schreiber, Naomi Watts and their boys Sasha and Kai, who take in a warm holiday Down Under at Sydney's Bronte Beach on Wednesday. 10 of 15 GOING DOWN Michael Buckner/WireImage Look out below! Courteney Cox and costar Ian Gomez are ready to slide at Cougar Town's cast and crew holiday party hosted by Bacardi on Tuesday in Culver City, Calif. 11 of 15 SUNNY OUTLOOK INF What's so funny? Cameron Diaz breaks into giggles Tuesday while grabbing food with beau Alex Rodriguez (not pictured) during the couple's holiday retreat in Cabo San Lucas, Mexico. 12 of 15 TAKE COVER Inter/Bauer-Griffin Kirsten Dunst tops off her new do with a possible purchase Tuesday while shopping in New York. 13 of 15 BUSY BODY Beiny/Fu/WENN Rain, rain, go away! Jessica Alba squeezes in some shopping with 2-year-old daughter Honor by her side Tuesday at L.A. shopping center The Grove. 14 of 15 GIRL POWER Sara Jaye Weiss/Startraks Real Housewives of New York City's Kelly Bensimon enjoys girl time – and a group hug! – with daughters Sea, 12, and Teddy, 10, Wednesday in New York. 15 of 15 IN THE HOOD Splash News Online It may be cold – but a bundled-up Liv Tyler is happy to send out a warm wave Wednesday while strolling through New York's West Village neighborhood.