Grey's Girls Gone Wild!!!

Private Practice star Kate Walsh celebrates her bachelorette party with former Grey’s Anatomy co-star Sara Ramirez party and co-star Justin Chambers‘ wife Keisha at Tao nightclub inside the Venetian Hotel, Las Vegas on Saturday night.

Sounds like a wedding is in the works and will happen soon!!!! Kate, 39, has been engaged to movie exec Alex Young for about three months now. (Sara looks like she guzzled down one too many! And might I note, Keisha looks slammin’!)

The season 4 premiere of Grey’s Anatomy, episode “A Change Is Gonna Come,” airs September 27 @ 9PM ET/PT on ABC. The series premiere of Private Practice airs the day before — Wednesday, September 26 @ 9PM on ABC.

More pics inside of Kate‘s bachelorette party…