Jun 3, 2011 18:01 GMT  ·  By

The most successful celebrity designer ever, Jessica Simpson, and her sister Ashlee are about to embark on a joint business venture. The two will serve as co-directors of an upcoming tween fashion line, it has been announced.

The line will be part of the Jessica Simpson Collection, officially the best selling collection ever designed by a celebrity, People magazine reports.

As such, it wouldn’t be a stretch to say that it too will be a hit, especially with the two sisters promising items for all ages, body shapes and styles.

“The new products, available in stores in fall, will be geared to the fashion-forward tween and will feature sportswear, denim and activewear styled after Simpson’s ‘girly, playful attitude’,” says the celebrity publication.

“Knit tops, hoodies, pullovers, striped shrunken knits, graphic T-shirts, drawstring pants, footwear and outerwear will all be part of the collection, with both Jessica and Ashlee serving as co-creative directors for the line,” People further writes.

Speaking about the launch of the new line, Jessica says bringing Ashlee on board came as a natural decision. Moreover, Ashlee will bring an extra edge to Jessica Simpson products.

“Creating a tween apparel collection was a natural extension for the brand. I’m excited to bring my sister, Ashlee, along as co-creative director of this division, because she brings a savvy rocker edge that defines today’s tweens,” Jessica says.

Ashlee echoes the same sentiment, saying that she aims to help girls be more creative with fashion, while also using it to express and define their personality.

Knowing her personal style, it’s not hard to imagine how her contribution to the line will look like: perhaps with lots of hats and funky accessories, skinny pants and oversized scarves.

“My goal as co-creative director will be to design clothes that will help inspire young girls to express their personalities and creativity through fashion,” she says, as cited by the same publication.

No further details are available right now but, judging by how Jessica conducts her fashion empire, fans can expect quality and trendy items at a very good price.

In the end, that’s all customers can dream of.