Solid gold!

Nicole Richie boogie oogie oogied as she celebrated her 35th birthday with an epic disco-themed party on Sept. 23.

Also getting down? Husband Joel Madden, dad Lionel Richie, sister-in-law Cameron Diaz, and pals including Jessica Alba, Kate Hudson, Ellen Pompeo and Rachel Zoe.

Nicole took to Instagram to share a fun video chock-full of photos from her party, held two days after her actual birthday, at the Standard in West Hollywood, California, captioning the clip, "35 ⚡️💋⚡️ #NightFever."

35 ⚡️💋⚡️ #NightFever

A post shared by Nicole Richie (@nicolerichie) on

Nicole's dad Lionel got in on the costumed fun in a gold shirt, a medallion and a soul patch.

"The real deal the one and only@lionelrichie and @nicolerichie #solidgold#theoriginal #hbd🎂 ❤️💙#oldfriendsarethebestfriends," Rachel captioned a pic of herself with Nicole and Lionel.

Nicole's rocker husband branded the father-daughter duo "2 of a kind" in another Instagram snapshot.

2 of a kind @nicolerichie @lionelrichie

A post shared by Joel Madden (@joelmadden) on

Kate also shared a glam selfie she took with Nicole.

"Happy birthday gorgeous! 🎂😘🎂 @nicolerichie #DiscoNight 💃," Kate captioned the pic.

Rachel also shared pics of herself posing with Jessica as well as the birthday girl.

"She's that pretty on the inside too @jessicaalba #hbd🎂 #girlfriends#disconight #lalaland," Rachel wrote alongside the pic of Jessica, who donned a gold lame dress for the occasion.

Nicole's '70s era makeup was on display in another pic from Rachel.

Happy b-day, Nicole!