Denim Designer Jessica Simpson

Jessica Simpson is launching a denim range.

The 29-year-old singer will create the line to help girls' butts "look good" as she knows how important it is to have a well-fitting pair of jeans.

She said: "Because I live in denim, the fit was the most important. A girl's booty needs to look good.

"I was inspired to create a great denim line that complements the entire Jessica Simpson lifestyle brand - a jean that becomes a girl's best friend, that everyday go-to pair."

Jessica has had a public battle with her weight and came under heavy criticism after it appeared she had gained a few pounds.

However, she has made it her mission to inform people about the difficulty of maintaining a stick-thin figure, recently filming a documentary titled 'The Price of Beauty'.

She said: "I haven't always had an inner confidence and I haven't always looked at my reflection and loved it. There's always something I've wanted to fix because there's always somebody that looks better. And that's what we always try to compare ourselves to.

"I think the journey really was finding what is beautiful inside of me and knowing that I own it and it's unique. Rare. It was a very powerful journey."