Ashlee Simpson is set to design her own range of T-shirts for teenage girls.

The singer - who is dating Fall Out Boy rocker Pete Wentz - has teamed up
with US store Wet Seal, which will sell the tops in conjunction with the
release of her third album 'Bittersweet World'.

She said: "I was inspired by so many fun, wonderful things as I was
recording 'Bittersweet World' and it's been great to carry through those
inspirations into these new shirt designs. I hope my fans love this album
and rock out in these shirts!"

Wet Seal is a young women's clothing retailer which stocks moderately priced
brand name and company-designed apparel and accessories.

Ashlee is following in the footsteps of her older sister Jessica, who
released her own fashion range in 2005.

Other stars with their own clothing lines include Victoria Beckham, Kate
Moss, Jennifer Lopez and Mary-Kate and Ashley Olsen.

(Pics of Ashlee in Bel-Air here)