The competition is fierce as the All-Stars meet reality star Kristin Cavallari, who tells them what it takes to be a celebrity personality in Hollywood.
Take a look back at the teenage years of musician Lenny Kravitz, reality starlet Kristin Cavallari, and actor Bryan Greenberg.
Lo calls into the 'After Show' and gives her take on Kristin Cavallari joining the cast of 'The Hills' and more.