She may be a mom, but Nicole Richie’s still got a bit of bad girl up in her. The not-so reformed wildchild was ejected from the Hard Rock Hotel & Casino in Sin City after getting into a brawl with an unidentified female on Saturday night.

TMZ reports:

We’re told Nicole was involved in an altercation around 1 AM this morning with a female while in line at the valet outside the Hard Rock Hotel in Las Vegas. Sources say Richie was so rowdy she had to be escorted off the property by security!

Sounds like Harlow’s mama hasn’t turned over a new leaf after all.