Spotted!

World famous DJ Tiesto and Three 6 Mafia, filming their new music video for "Feel It," also featuring Sean Kingston and Flo Rida, at The Bank Nightclub at the Bellagio Hotel in Las Vegas. Tiesto dined at famed Japanese restaurant Yellowtail before heading to the nightclub.

Anderson Cooper working out at DavidBartonGym in NYC's Astor Place on Oct. 7.

Real Housewives of New York's Jill Zarin and the Vampire Diaries' Kayla Ewell at the Svedka Vodka Sessions at Morgan's Hotel in NYC on Oct. 1. Kayla got in some retail therapy at the Armani Exchange on 5th Avenue in NYC before dropping by the event.

Mariah Carey celebrating the launch of her new record with close friends and family at an intimate dinner at Charles Restaurant in NYC on Oct. 1.

Producer Christine Peters dropping by Chris Rock’s Good Hair premiere rocking a Gucci suit and Jimmy Choo heels.

Lea Michele, star of Fox’s new breakout series Glee, clad in Helmut Lang’s sexy Bondage Jersey combo dress, rocking out at the hit show Rock of Ages with her parents in tow. The trio sang and danced along to “Don’t Stop Believin” with cast and audience members during the big finale number.

Robert De Niro dining at Spiaggia in Chicago.

Rosie Perez bidding $1,000 to visit the Vogue closet during the live auction at the We Are Family Foundation’s Fundraising Gala in NYC.

Arnold Schwarzenegger eating roasted tomato soup and a cobb salad at lunch at Viceroy Santa Monica.

Jane Seymour attending a gala in Sedona to raise funds for Camp Soaring Eagle, a free of charge, medically-based camp which will serve kids living in Arizona and the Southwest with critical or life-threatening illnesses.

Dr. Maya Angelou was honored at The 24th Annual Great Sports Legends Dinner in NYC.

Taylor Momsen sporting the Treesje "Mason" cross-body handbag from their fall collection while on the set of Gossip Girl in NYC on Oct. 4.