For the former child stars and current fashion entrepreneurs, one project at a time is never enough: in addition to their successful The Row label and Walmart fashion range, Mary-Kate and Ashley have launched their new online venture StyleMint.

The first limited collection of t-shirts has just been released, with shopping suggestions tailored to customers' personal preferences, submitted prior to the launch: short questionnaires are required to be filled in to attain membership at StyleMint.

The range features eight different styles, priced at $29.95 each. Members will be able to share the individual t-shirts with their friends via Facebook or Twitter to ask for their shopping advice.

StyleMint is part of BeachMint, an e-commerce company that also owns JewelMint, a similar 'monthly fashion club' for jewelry, curated by actress Kate Bosworth and stylist Cher Coulter.

"BeachMint understands how online shopping is evolving and the importance of creating an authentic relationship between designer and customer," Mary-Kate Olsen told Women's Wear Daily. "With, Ashley and I have created an online experience reflecting our love of style and allowing us to engage with our customers directly, which is an inspiring new way for us to think and create as designers."

Sign up for membership at