Chelsie Hightower, Katherine Jenkins, Cristina Driver, Cristian Driver, Maria Menounos, Derek Hough

Eric Roberts and Boo Boo and Fivel Stewart step out for G Tom Mac's Untame the Songs CD release party at the Rolling Stone Restaurant & Lounge; Maria Menounos, Chelsie Hightower and the rest of cast of "Dancing With The Stars" enjoy another post-show after party at Mixology 101; Slipknot band members give insight into the music industry to students at Musicians Institute; Jonathan "J-Devil" Davis of KoRn hosts a listening party for their new album at Dim Mak Studios—get the inside scoop on who partied where Monday night in Los Angeles in this edition of Last Night's Parties!

Chelsie Hightower, Katherine Jenkins dance with DWTS cast member Donald Dirver's kids Cristina Driver, Cristian Driver [via], Maria Menounos, Derek Hough [via]