Britney Spears performing at the New Orleans Arena on the opening night of 'The Circus: Starring Britney Spears Tour'. New Orleans, Louisiana - 03.03.09

Seacrest made the announcement on his Los Angeles radio show on Wednesday morning (22Apr09), insisting the pregnancy report came from "reliable source".

But Spears' camp has squashed the rumour.

Leber tells PerezHilton.com says, "She's absolutely not pregnant. I have no idea where this ridiculous rumour came from. Ryan has communication with our camp and could have checked this before saying it."

Source: WENN