Josh Henderson Josh Henderson

Josh Henderson, who on Desperate Housewives played Edie's motorcycle-riding, Julie-tempting nephew, is joining the CW's 90210, has learned exclusively.

Henderson will first appear during November sweeps, when the P.I. who's been on the prowl for Harry's son by Naomi's mom, Tracy, turns up a real charmer named Sean.

The new kid on the palms-lined block won't wow everyone, however.

Dixon, for one, will feel displaced by his Dad's biological boy, while a wary Debbie elects to keep her hubby's illegitimate offspring at arm's distance.