Look out Vonda Shepard. Reuters reports that Ally McBeal's newest legal eagle, Robert Downey Jr., will sing two songs on the show's new holiday-themed CD, A Very Ally Christmas, due in stores Tuesday. The actor — who signed on to do 10 episodes of the David E. Kelley drama after being released from prison last August — will belt out a cover of Joni Mitchell's "River" and collaborate with Shepard on a duet of "White Christmas."