Osbourne's guest-host appearance will be on Wednesday, April 14. Osbourne made her theatrical stage debut when she starred as Mama Morton in the West End's production of CHICAGO. Osbourne has also starred on the ABC drama "Life as We Know It" and was also a contestant on the reality dancing competition "Dancing with the Stars." Williams will guest-host on Tuesday, May 11. She can currently be found in the Roundabout Theatre Company's Broadway production of SONDHEIM ON SONDHEIM, also featuring Barbara Cook, Tom Wopat, Norm Lewis, and Matthew Scott. Past stage credits of Williams' include INTO THE WOODS and KISS OF THE SPIDER WOMAN. She is also a three-time Emmy Award nominee for her role on "Ugly Betty," which will have its series finale on Wednesday, April 14. The view stars hosts Barbara Walters, Whoopie Goldberg, Joy Behar, Sherri Shepherd, and Elisabeth Hasselbeck. It airs at 11:00am EST on ABC.