Jessica and Ashlee Simpson launched their girls' clothing line yesterday (01.12.11).

The sisters - along with Jessica's fiance Eric Johnson and Ashlee's three-year-old son Bronx - mingled with the young guests at Dylan's Candy Bar as the T-shirts, shoes and jeans went on sale for the first time.

Proceeds from the sale of a specially-designed T-shirt will go to Baby Buggy, a charity founded by Jessica Seinfeld, while there are plans for an online design contest for a t-shirt to be included in the forthcoming back-to-school collection.

Describing the new range, which is released through the Jessica Simpson label, pregnant Jessica said: "It's a combination of both of our styles. Ashlee is very rock 'n' roll, and I'm very American."

Jessica also revealed she has signed a deal for a maternity line and will also design girls' footwear.

She also admitted she may branch out further if she discovers she is expecting a son.

She told WWD: "Boys' clothing is a possibility."

As well as awaiting the birth of her baby, Jessica is currently working on her spring 2013 women's collection, which she joked is so far out "my baby will be one".