Ashlee Simpson is expecting a baby boy. The singer's husband, Fall Out Boy rocker Pete Wentz, says the couple are almost certain that they know the gender of their unborn first child.

He said: "We know with 90 per cent accuracy that it's a boy, and our due date is around Thanksgiving." However, the bassist says they haven't picked out a name for their pending new arrival yet, but promises it will be "rock star worthy".

He added to Playboy magazine: "We don't have any names yet. My friend Andrew said, 'Your kid has to have a name that would fit either a rock star or a senator.' "

Earlier this week, a spokesperson for the couple was forced to deny they were expecting twins after hip-hop star Tyga - a friend of Pete's - said: "Pete and Ashlee are having twins.

They're really happy." However, Ashlee and Pete, who married earlier this year, insist they are only looking forward to welcoming one child into the world in November.