Caught in the Act! Jessica, Ashlee, Eva & More

11/28/2006 at 11:00 AM EST

• Jessica and Ashlee Simpson, sipping margaritas at Austin hot spot Chuy's with their parents. "Ashlee loved the strawberry 'ritas that she ate along with a chicken burrito she split with Jessica," an onlooker told us. Though they tried to get a little privacy by sitting on the patio, before they left, the sibs posed for pictures and signed autographs for fans.

• Orlando Bloom, flirting with several female guests at a poolside party for the opening of hairstylist Lea Journo's new spa and salon at the Beverly Wilshire Hotel.

• Jay-Z, beaming as the crowd at New York City club Butter rapped along to a medley of his tunes including "Big Pimpin'" and "Girls, Girls, Girls." The hip-hop star spent the evening chatting with a group of friends, including Butter co-owner Richie Akiva and made a grand exit as his new single "Show Me What You Got" blasted over the speakers. Also making the scene: actor-model Tyson Beckford and Jamie-Lynn Sigler, who chatted in a banquette with her club co-owner beau, Scott Sartiano.

• Nicole Richie, lunching with mom Brenda and a pal at L.A. eatery The Ivy. But Richie's attention wasn't only on the meal, which included a grilled vegetable salad and prime rib. "Nicole was looking over a script for much of the meeting," says a fellow patron.

More Celeb Spotting

• More Celeb Spotting

• American Idol star Ace Young, being treated to a seductive burlesque dance at his 26th birthday party at Hollywood's Level 3 club. It was an AI reunion: The guest list included alums Katharine McPhee, Elliott Yamin and Kimberly Caldwell.

• Mark Wahlberg, getting his food to go from Café Mauro at Fred Segal in West Hollywood. Also lunching at the eatery: – former Dawson's Creek star Joshua Jackson.

• Michael Vartan, dining with three male pals at West Hollywood's Koi. During the guys' night out, the pals chatted over sushi and sake.

• Aerosmith frontman Steven Tyler, buying an orange 2 B Free tracksuit for a lady friend at Dallas boutique Epic Apparel. The next day, the rocker – who was in town with his band – returned to pick up another ensemble in pink.

Eva Longoria

Alexandra Wyman / WireImage

• Clive Owen, chatting with a large group of friends in the courtyard at Hollywood club Les Deux. Maroon 5 frontman Adam Levine and Liev Schreiber also milled around.

• Owen Wilson, grooving along at Pharrell Williams's concert at Hollywood's Boulevard3 club. Other celebs scoping out the concert: Derek Jeter, Topher Grace and Nicky Hilton, who danced along to the beat while her ex, Kevin Connelly, chatted up Leonardo DiCaprio on the dance floor.

• Eva Longoria, partying with several female pals at L.A.'s Hyde Lounge. The group feasted on Kobe beef and sipped white wine. "Eva was having a blast chuckling with her friends," says an onlooker. Also there: David Spade, who bobbed his head to Beck's song "Loser."

• By TIFFANY HOPKINS, KELLY LUMPKINS, MARY MARGARET, LYCIA NAFF and KIM PEIFFER