Ashlee Simpson has hit out at reports she and fiance Pete Wendz are planning to follow in the footsteps of her sister Jessica and star in a spin-off of U.S. reality TV show Newlyweds.

The 23-year-old Boyfriend hitmaker's father/manager Joe Simpson is reportedly in talks with MTV to create a copycat show for his younger daughter, to cash in on the pair's upcoming nuptials.

Jessica Simpson's 2003 show Newlyweds was a huge ratings winner - credited with reigniting the singer's flailing music career and prompting the demise of her marriage to former husband Nick Lachey.

A source tells U.S. magazine OK!, "Joe (Simpson) knows that no one cared about Jessica before her reality show, and he's hoping a show for Ashlee will have the same effect."

But a representative for Ashlee Simpson - who is busy denying rumours she is pregnant with Wentz' child - insist she has no intention of starring in a reality show.