Lily Allen admits her fashion range isn't "ground breaking".

The 'Not Fair' hitmaker - who married building firm boss Sam Cooper on Saturday (11.06.11) - admits she and her sister Sarah Owen don't do the actual designs for their Lucy in Disguise label and knows their collections are unlikely to change the face of fashion.

She said: "Sarah and me work with a designer called Nadia Jones. We tell her what we want and she does the sketches.

"We were inspired by vintage clothing - we're not doing anything ground breaking."

Lily also admitted working with her sister can be "challenging", but she is more honest with her about her feelings than she is with anyone else in their company.

She told more! magazine: "It's challenging. It can be a struggle with family members. It's difficult not to be honest all the time. There's a lot of tongue biting.

"Crispin, who I work with, and I disagree about stuff, but I always hold back because we're not related. There's a lot more horrible stuff I could say! But yeah, with my sister, when she starts to irritate me I just want to pull a face. But I don't think everyone else in the office would like it very much."