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Mary-Kate and Ashley Olsen are back with a brand new collection of eight StyleMint tees for September—and we’re bringing you an exclusive chance to preview the line before it’s available. (At left, Mary-Kate’s wearing the Sharkbite Polka Dot Tee in White!) Launched in July, StyleMint is a members-only site that allows users to purchase Olsen-designed t-shirts for just $30 a month, and get styling tips straight from the twins. Click “See the Photos” for a full sneak peek!

BONUS! InStyle readers can shop the September collection today! Head over to StyleMint now!