RUMER'S SWEET 16TH
Bruce Willis and Demi Moore's oldest daughter, Rumer, saw red at her 16th birthday party. Lots of it. Many of the 200 guests turned out in costume for a Moulin Rouge-themed bash held Aug. 20 on the tennis court at Ashton Kutcher's Beverly Hills house. The decor was highlighted by red velvet beds and couches, while the entertainment included fire-eaters, dancers and contortionists. Cohosts Kutcher and Willis wore matching top hats and canes to greet guests, who included Paris Hilton and boyfriend Jason Shaw, David Spade, Christina Applegate and Johnathan Schaech. The evening's fare? Grilled cheese, french fries and pizza. A partygoer says that the three Willis sisters danced together and sang along to the music. The event even ran on teen time: The bash wound down at midnight.

THE BUZZ ON NICK
Nick Carter's closely cropped haircut—the handiwork of bandmate A.J. McLean—isn't the only new thing in his life. The Backstreet Boy, 24, who split with Paris Hilton in July, has begun seeing Playboy Playmate Dalene Kurtis, 26. The duo, who first met a few months ago, recently reconnected and have gone on several dates, including a recent screening of Open Water. A friend of Carter's says, "You can tell he's smitten." Adds Carter's rep: "It looks like they're having a lot of fun. He's moving on."

WILL & GRACE & J.LO
Jennifer Lopez, who sang at the Vegas wedding of Megan Mullally's Karen in the season finale of Will & Grace, returned to the set Aug. 16 and 17 to tape another guest appearance. Picking up where she left off, Lopez shot four scenes for the series' Sept. 16 season opener and "was such a good sport—so funny and game for anything," according to Grace executive producer Alex Herschlag. "She was willing to make fun of herself." In one scene, the briefly married Karen tells Jack (Sean Hayes) and J.Lo that her Vegas nuptials lasted only 20 minutes. "And that's short, right?" deadpans Lopez. Marc Anthony even showed up one night to watch his wife perform. Says Herschlag: "He looked really happy."

FAST TAKES
Emma Roberts hasn't seen her pregnant aunt Julia recently, but the 13-year-old actress, who stars in the new film Grand Champion (lensed by cinematographer Danny Moder), is getting ready for the arrival of her cousins. "I'm so excited," Roberts says of the twins. "I'm going to spoil them. I'll be the babysitter whenever she needs me."...For his 35th birthday Aug. 19, Matthew Perry and a group of buddies took a private plane to Las Vegas, where he played in Bravo's Celebrity Poker Showdown and hung out with basketball great Michael Jordan at Body English, the new nightclub at the Hard Rock Hotel & Casino.... Gwen Stefani, who has her own clothing line under the fashion label L.A.M.B., is designing a wedding dress for the fiancée of her No Doubt bandmate Tom Dumont.