Boo Gazing: Celebs Seen On The Scenes: Simon Cowell, Paula Abdul, Jay-Z, Zoe Saldana and more

Nicole Scherzinger, Simon Cowell, Paula Abdul, Antonio "L.A." Reid and Steve Jones attend "The X Factor" World Premiere Screening at ArcLight Cinemas in Hollywood.

Michael Douglas, Rosie Huntington-Whiteley and Zoe Saldana attend the Michael Kors Spring 2012 fashion show.

Selita Ebanks, Ne-Yo and Serena Williams attend The Compound Foundation 2011 Annual Benefit.

Singer Alicia Keys attends the Proenza Schouler Spring 2012 fashion show during Mercedes-Benz Fashion Week.

Jay-Z, Zoe Saldana and Nas attend Nas' 38th birthday party at Catch.

Stunning LaLa Vazquez and Carmelo Anthony attends Nas' 38th birthday party at Catch. We love that dress color.

Michael Kenneth Williams, Mark Birnbaum and Common attend Nas' 38th birthday party at Catch.

Lindsay Lohan makes her way into the Standard Hotel in New York for the Lovecat party.

Jessica White attends the Herve Leger By Max Azria Fashion show in New York.

50 Cent attends the Street King by 50 Cent Double Decker Bus Tour in Times Square.

Tyra Banks signs copies of her new book "Modelland" at Barnes & Noble.