Star Tracks - Monday, August 20, 2007

After the record-breaking debut of High School Musical 2, Zac Efron (with a new script in hand?) has some bargaining power during a business lunch in Los Angeles on Saturday.

After getting served with legal papers in pal Britney Spears's custody battle, Alli Sims chills out with a new famous friend – Paris Hilton! – during a barbeque at the heiress's Malibu beach house on Saturday.

She may be planning to get back to work soon – but Jennifer Aniston still makes time for fun with her friends. The actress spent Saturday paddle boarding in Hawaii with pals David and Courteney Cox Arquette and their daughter Coco, 3 (not pictured).

No piggyback this time! Kate Hudson and new guy Dax Shepard – along with Hudson's son Ryder, 3 – continue getting cozy during a stroll through Boston on Friday.

While rumors of an engagement swirl, Nicole Richie and Joel Madden take in the sights in Washington, D.C.'s Georgetown neighborhood on Friday.

Naomi Watts keeps her son Alexander cradled close during a stop at a Brentwood, Calif., post office on Saturday. The next day, the actress and her beau Liev Schreiber hit the beach with their newborn.

Donald Trump and Star Jones Reynolds have a field day Saturday at the Bridgehampton Mercedes-Benz Polo Challenge in Bridgehampton, N.Y. Trump, whose Trump on the Ocean catered the affair, talked about one of his favorite subjects – The View, telling PEOPLE: "I've been in two of [Whoopi Goldberg's] movies, so I assume she likes me."

Angelina Jolie and Brad Pitt take their brood for a family cruise Saturday along Chicago's Lake Michigan to watch the annual Air and Water Show.

Smells like a hit! Gwyneth Paltrow takes great pleasure in autographing bottles of her limited-edition Estée Lauder fragrance, Pleasures Delight, at a Macy's in Chicago on Friday.

In the Big Apple to play a game against the New York Red Bulls, L.A. Galaxy star David Beckham takes time out for some lucky kids during a youth soccer clinic in Harlem on Friday.

High School Musical 2 star Vanessa Hudgens happily signs on for an impromptu autograph session outside the New York studio of Live with Regis amp Kelly on Thursday.

Well, someone has to stay awake! Keri Russell keeps slumbering 2-month-old son River close to her heart as she heads to a Manhattan park after stopping for some iced coffee on Friday.

Feeling camera shy? Lily Allen has a solution: After a night of partying at London club Punk, the singer (who has plenty of downtime after postponing her U.S. concert dates) gets carried out in a large bag by a group of pals on Thursday.

Debra Messing (in Gaultier) is a shoo-in candidate to open Saks Fifth Avenue's new designer shoe department in New York on Friday. The former Will amp Grace star says of her own stylish John Kelsey heels, "I just felt madly in love with them last night. I got them off the new floor at Saks."

Lance Bass shows he's the host with the most as Corny Collins during his Broadway debut in the musical Hairspray on Thursday. The former 'N Sync-er will be in the production through the new year.