SISTER ACT - Whoopi will join the cast! Jul 7, 2010 10:36:45 GMT -5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by santtu on Jul 7, 2010 10:36:45 GMT -5 Whoopi Goldberg will join the cast of SISTER ACT the musical in London! It's a limited engagement, 3 weeks in August! www.playbill.com/news/article/140966-Back-in-the-Habit-Whoopi-Goldberg-to-Join-London-Cast-of-Sister-ActI so have to see this!! I saw her in XANADU.