Disney star Demi Lovato, who is dating Joe Jonas, guest stars on tonight's episode of "Grey's Anatomy." The one-hour show airs 9 p.m. on ABC.
Lovato will reportedly play a troubled teen.
Next week marks the "Grey's Anatomy" season finale. Fans are already wondering if this year's season-ender can match the shock of last year's finale, which left two characters' futures up in the air. We had to wait months before learning if George O'Malley and Izzie Stevens died.
Next week's season finale will involve a crazed gunman at Seattle Grace, Entertainment Weekly reports.
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