Jessica Simpson has reportedly been replaced by a monkey as the co-host on sister Ashlee Simpson’s new chat show.

An inside source told the Daily Star: “Ashlee is working on a new chat show for a top US network under the working title The Ashlee Simpson Show.

“She has a strong following among the new rock kids, especially as she and [boyfriend Pete Wentz] are the hottest couple right now - that’s the demographic they’re after.”

“Ashlee rather loyally wanted Jessica to be her co-host. But bosses weren’t keen as Jessica is seen as a bit naff. She’s older and linked to a different world of celebrity.”

Instead, Ashlee will be joined by Kate, a rhesus macaque, who is said to have directed Fall Out Boy’s ‘Thnks Fr Th Mmrs’ video and attended this week’s Kerrang! Awards with the band.

The source explained: “The show’s producers want a quirky show. They thought it would be really funny to have the monkey co-host the show.”

“She’s going to be the rock monkey and will ‘direct’ other bands coming on the show. Sadly, this format change meant there was no place for Jessica. The monkey is the co-host they want. It must be a blow for her.”