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Posted Sun, January 2, 2011 12:58pm EDT

Beyonce, Blake Lively, Cameron Diaz, Gwyneth Paltrow & More Party With Jay-Z In Vegas On New Year's Eve!

It seems like all of Hollywood relocated to Las Vegas For New Year’s, and they all partied at Jay-z’s massive concert!

It may only be the second day of 2011, but the grand opening of Marquee Nightclub & Dayclub at The Cosmopolitan of Las Vegas may already be in the running for biggest, and greatest, party of the year! HollywoodLife’s Editor-in-Chief Bonnie Fuller was there for the opening weekend, which culminated in a concert featuring Jay-Z, Coldplay, Kanye West, John Mayer and Beyonce brought out stars including: Blake Lively, Kellan Lutz, Gwyneth Paltrow, Mark Wahlberg, Kirsten Dunst, Cameron Diaz and Alex Rodriguez, Diddy and many, many more.

There was Ellen Pompeo and husband Chris Ivery, Jessica Szohr, James Marsden, Channing Tatum and Jenna Dewan, Jennifer Lopez and Marc Anthony, Olivia Munn, Whitney Port, Ashley Olsen, Mark Salling and even more.

Over the course of the weekend, HollywoodLife spotted Cameron and A-Rod shopping for shoes and Blake attempt to get back to her room after being locked out of her floor!

As great as your New Year’s party may have been, it seems like this one has it beat!