Christina Aguilera & Nicole Richie: Boa BFFs

Christina Aguilera and Nicole Richie grab lunch together at Boa Steakhouse on Monday (November 15) in West Hollywood, Calif.

Earlier in the day, Christina was honored with her own star on the Hollywood Walk of Fame!

The Burlesque star and Nicole, both 29, have been hanging out a lot lately. The two recently even double dated at the Soho House.

10+ pictures inside of Boa BFFs Christina Aguilera and Nicole Richie…