Christina Aguilera and Nicole Richie: Hello 2010!

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 time to visit one another and pose for pictures before leading their party guests in the 2010 celebration.

Celebrity Gossip

Enjoy the pictures of Christina Aguilera and Nicole Richie ringing in the New Year (December 31).