Reese Witherspoon Photo by: David Greenman / starmax
What's Reese's Secret Weapon?
Reese Witherspoon had a secret weapon while filming Vanity Fair, in which she plays classic social climber Becky Sharp: Her pregnancy with second child, son Deacon, now 10 months old. "It made the emotional scenes really easy," she told us at the recent New York premiere of the movie (opening Sept. 1). "I was very hormonal, so that was good." As for her new look as a brunette for her upcoming role as June Carter in the Johnny Cash biopic Walk the Line, 28-year-old Witherspoon says, "It's nice for a change. I haven't changed my hair color in 10 years, so it's fun."

Hair Apparent
Speaking of blondes who've gone to the dark side, we almost didn't recognize former O.C. costar Samaire Armstrong (who's now on HBO's Entourage) when she arrived at V Life's Emmy Nominee Photo Portfolio unveiling at the W hotel in L.A. last week. So we asked about her striking new look. "When I first did it, I was like, 'Ugh.' I actually went back to blonde because it was so unnatural," says Armstrong, 23. "Then I did it again and I feel way more comfortable with it now. It's weird because people don't really recognize me sometimes. And I'm like, 'It's Samaire.' And they're like, 'Oh my God, you look different!'" See – it wasn't just us.

Dodging the Question
Dodgeball is a relatively simple sport – or maybe it just seems so to we Americans who grew up playing it. Ben Stiller and Vince Vaughn, stars of Dodgeball the movie, found themselves having to explain the game at the film's recent London premiere. "It's a silly sport, which is quite easy to understand," says Stiller, 38. "Hit or be hit or catch the ball and you're still in. The idea of the movie is like an underdog team, only we made up the rules of the game along the way." Added Vaughn, 34: "It's like any childhood game you play where, unfortunately, someone's got to be picked last, where feelings are hurt. It's an aggressive sport, sort of like British 'Bulldog,' especially when you're out of shape and without any padding." As for his uber-cheesy look in the movie, complete with mullet, Stiller says: "Patrick Swayze really did the best in Road House in 1989. And that's sort of the look we were going for."

Caught in the Act
Spotted Recently:
Sean Penn, enjoying an iced latte at Starbucks in Malibu while wife Robin Wright Penn went shopping with their 13-year-old daughter, Dylan.

Naomi Watts, dining with six friends on the patio at L.A.'s Chateau Marmont.

Sopranos star Aida Turturro, shopping for shoes at Bergdorf Goodman in New York. She walked out with a pair of square-toed leopard-print Manolo Blahniks – perhaps for the Emmys?

Philip Seymour Hoffman, at a cocktail party on the patio at designer Cynthia Rowley's East Hampton store.

• By KATHY EHRICH, DANA MELTZER, MICHELLE EDGAR, KWALA MANDEL and ALLI JOSEPH