Rumours are flying that Sharon Osbourne won’t be returning to America’s Got Talent after this season, fuelled by a tweet from Ms. Osbourne herself.

“My darling @HowardStern, money is not the reason I’m not returning to @nbcagt, it’s because…”

That ” … ” has yet to be explained, but expect Osbourne to elaborate on this vague-yet-provocative tweet in the near future. Her comment, however, adds to the speculation that Osbourne and fellow judge Howie Mandel are less than thrilled that they’re being overshadowed now that AGT has essentially turned into The Howard Stern Show with this season’s addition of the controversial shock jock to the judging table.

Meanwhile, NBC president of alternative programming Paul Telegdy expressed his desire to bring Osbourne’s co-judge Howard Stern back for one more season, telling journalists assembled at the TV Critics Assocation press tour this morning that he’s been very happy with Stern’s performance and hopes he’ll be back on the show next year.