Celebrating the transition into 2010, Christina Aguilera and Nicole Richie were in party mode in Las Vegas on Thursday night (December 31).

With both ladies looking quite stunning, Christina celebrated the New Year at Tao Nightclub while Nicole hosted a bash at Lavo.

Making for quite the experience, guests in attendance were allowed to go

back and forth to both Miss Richie and Miss Aguilera’s parties after midnight.

And while Nicole and Christina had their own events to tend to, the two Tinseltown pals made moment to visit one another and pose for pictures before leading their party guests in the 2010 celebration.

Original post by http://www.gossipgirls.com