Audrina Patridge and Lance Bass hit The Thirst Project's 3rd Annual Gala; Elijah Wood, Russell Brand and Louis C.K. step out for FX network's Summer Comedies Party at Lure; Bruno Mars and and Tommy Lee attend the Spotify Quincy Jones Media Event at Andaz; Justin Bieber, Selena Gomez and more join Katy Perry at the big Hollywood premiere of her Katy Perry: Part Of Me documentary—it was quite a star-studded eventful Tuesday across Los Angeles and we have the details on what went down where in this edition of Last Night's Parties.

[Katy Perry photo via]