Nicole Richie: Boogies Down For 35th Birthday Disco Bash

Nicole Richie turned 35 this week ... and she continued feelin' the funk into the weekend.

Richie celebrated Saturday night at the Standard Hotel with a pretty awesome disco theme. Among those in attendance ... daddy, Lionel Richie, Jessica Alba, Kate Hudson, Cameron Diaz, Benji Madden, and her hubby, Joel Madden.