The singer and actress teamed with DKNY to create her own collection.
Called Femme for DKNY Jeans, the line will be available in American stores next fall.
Duff said that the most difficult part of the process was finding a name for the collection that was both feminine and tough.
The busy young star will soon have her own television series on FOX, and will be starring in the remake of the film Bonnie and Clyde.