Pete Wentz denies Simpson pregnancy reports

Pete Wentz and Ashlee Simpson

Rocker Pete Wentz has dismissed reports his fiancee Ashlee Simpson is pregnant with his baby, calling the media scrutiny on the couple a "witch hunt".

Wentz and the pop star sister of singer/actress Jessica Simpson confirmed reports they had become engaged last week, and on Monday, American magazine Us Weekly claimed the 23-year-old was pregnant.

But Wentz insists this is untrue.

He tells MTV.com, "There is a witch hunt for people to be pregnant whenever they get engaged in Hollywood. This is all news to me.

"I can't wait for the story about how I'm really in a gay relationship and this is all just a cover... I mean, really, this is crazy.

"I mean we're engaged, that's true, and happy about it."