KATIE Holmes is reportedly set to appear on Glee. Sources say producers want the brunette beauty to play the younger sister of doe-eyed teacher Emma Pilsbury and are trying to sign her up for season three of the hit show. Katie is a fan of the show and has made it no secret that she loves watching the musical numbers with Suri, dished one insider. Bosses are hoping that this coupled with the fact she is good friends with Dianna Agron [Quinn] that she will be persuaded to come on board. They want her character to make a bee-line for Mr Schue and his affections. She has already shown she can sing and dance on the Broadway. SS