With Payless and Victoria's Secret collabs already under his tiny, tiny belt,  Project Runway alum Christian Siriano is officially a design force to be reckoned with.

But the pint-sized (unless we're talking PERSONALITY, all caps required) designer isn't done yet; for Spring 2010, he's created a maternity collection dubbed Fierce Mamas for Moody Mamas by Christian Siriano.

In case you're not familiar (I wasn't), Moody Mamas is a hip wardrobe solution for moms-to-be that aim to keep their sexy, sophisticated style throughout their entire pregnancy – think celeb moms like Heidi Klum, Jessica Alba, Ashley Simpson and Tori Spelling, all of whom are fans of the line.

Moody Mamas is the brainchild of two twenty-somethings, Marta Abrams and Elise Rosemarin, who are single and have never had children – admittedly an unlikely pair to design a maternity line. Perhaps that is precisely why they have been so successful?

Of the collaboration, Siriano said, “Who doesn't want to be a fierce mama? ... I love a fab mom to be and I think the Moody Mamas have hit the mark from head to stiletto!”

Check out a sneak peek of the collection in the gallery below!