Sharon Osbourne leaving 'America's Got Talent'? 'Money is not the reason'

"America's Got Talent" judge Sharon Osbourne tweeted a rather cryptic message Tuesday (July 24) -- "My darling @HowardStern, money is not the reason I'm not returning to @nbcagt, it's because... "

There is no follow-up tweet and her tweet is not in response to anything fellow judge Howard Stern posted on Twitter. It appears to be apropos of nothing, actually. It can be speculated that if she does leave, it could have something to do with son's Jack recent multiple sclerosis diagnosis.

Osbourne has been with "AGT" since Season 2, previously sitting beside David Hasselhoff and Piers Morgan, both of whom have since left the show. We'll keep you posted as the story develops.