The departure of longtime host Regis Philbin has meant his 'Live!' co-host Kelly Ripa will work with a whole cavalcade of guest hosts while a permanent replacement is found. Now four more celebs have signed on, including Jerry O'Connell and singer-actor Josh Groban.

Both stars, who've filled in as hosts before, have announced they'll be back -- O'Connell on the Friday after Thanksgiving, and Groban during a three-day stretch from December 7-9.

In addition, 'Dancing With the Stars' pro Derek Hough will share hosting duties with Ripa on December 5, with 'Moneyball' actor Jonah Hill giving it a go on December 6. Jerry Seinfeld sat in this week, and Neil Patrick Harris will join Ripa for a week beginning on Monday, November 28.

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