American Pie star Alyson Hannigan is pregnant with her second child.

The actress dismissed rumours she was expecting in September, citing a bad diet and poor outfit choices for her bulging belly.

Alyson Hannigan with husband, Alexis Denisof.

Now, however, her representative has confirmed to UsMagazine.com that Hannigan and her husband, Alexis Denisof, are set to be parents again in 2012.

The star showed off her undeniable bump while running errands in Santa Monica, California, on Thursday.

A source told the website: "Alyson is thrilled to be pregnant. She has been wearing baggy clothes to cover the baby bump."

Hannigan and Denisof wed in 2003. They are already parents to daughter Satyana, two.

WENN