Exclusive: 90210's Big Bash Is Outasight!

90210will be partying hard when Outasight performs in a December episode, TVGuide.com has learned exclusively.

For Naomi (AnnaLynne McCord), there's good and bad news. First, the good: Naomi scores an internship. The bad: Her new boss turns out to be someone close to archnemesis Holly (Megalyn Echikunwoke), who enlists Naomi to plan Holly's birthday bash — where the "Tonight is the Night" singer will be performing.

Exclusive: Vampire Diaries' Arielle Kebbel to recur on 90210

The episode in which Outasight is slated to appear also marks the first appearance of Vampire Diariesalum Arielle Kebbel. As TVGuide.com first reported, Kebbel will play Vanessa, a charismatic, edgy and vivacious former bad girl who still enjoys a little risk-taking now and again.

Jersey Shore's Vinny, who makes his first appearance in next week's show, will also appear in this episode (for which an exact date isn't set).

90210 airs Tuesdays at 8/7c on The CW.