Xena Warrior Princess is coming out of retirement to save someone else's butt — and what a nice butt it is. Lucy Lawless is joining the cast of the WB's upcoming fall drama Tarzan. She'll play publishing magnate Kathleen Clayton, the loincloth-wearin' hottie's aunt. (In case you've been jungle-bound, Calvin Klein model Travis Fimmel will be the one sporting said loincloth.) Lawless's character will be at odds with her older brother Richard (Mitch Pileggi), who wants to use Tarzan for evil. Bottom line: Kathleen good, Richard bad, Tarzan hot.