Ashlee Simpson ASIMPSON041408_matt.jpg

Ashlee's gonna milk these pregnancy rumors for all they're worth!

She told the Today show's Matt Lauer this morning (reported by Us Weekly) that "only time will tell" if she's really pregnant -- she's not givin' it up!

"I am giving birth to my record ... that's my baby," she advertisedded.

Ash is also keeping her wedding date a secret; when asked about her impending nuptials to Pete Wentz she said the two are "just enjoying the engagement."

Pete got props for picking out a nice rock. Simpson said, "I feel like a really lucky lady ... He did a great job."