According to the gossip site, Ashlee will model clothing, accessories and shoes from the Jessica Simpson Collection Fall 2013, in a series of advertisements out later this month.
Ashlee is also the co-creative director of Jessica's youth line, Jessica Simpson Girls, though she told Life & Style on Thursday that she has her own designer ambitions.
The 28-year-old singer, actress and mother of one said she's working on her own line.
"It will be adult. It will definitely [be different from Jessica's,] she told the mag.
"I think there's a time and a place for certain outfits, and for me, it's also about comfort and kind of finding your own way with clothes," she said. "Knowing there is a time to mix and match and what mixes and matches [is always important]. It's always good to try, though!"