American Idol Alum Kellie Pickler to Guest-Star on 90210

American Idol's Kellie Pickler will make her acting debut on 90210, TVGuide.com has confirmed.

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Pickler, who finished sixth on the fifth season of Idol, will play Sally, the cousin of new character Austin (Justin Deeley), as first reported by TVLine.com. She'll also perform "Tough," one of her four songs to hit Billboard's Hot Country chart, during the episode.

90210 elects Brandy for recurring role

The 25-year-old country singer joins a growing cast of additions on 90210 this season, including Brandy, Buffy the Vampire Slayer's Sarah Hagan, CSI: Miami's Megalyn Echikunwoke and Privileged's Kristina Agpar.

90210 premieres Season 4 on Tuesday, Sept. 13  at 8/7c on The CW.