Mary-Kate Olsen: Pregnant By Nate Lowman?

Skinny star Mary-Kate Olsen has sparked rumours that she is expecting her first child after her weight shot up to a practically-obese 102 pounds.

A source tells the National Enquirer:

"Mary-Kate has been looking a lot rounder recently. It is good she has put on weight, because she previously suffered from anorexia, but a lot of people think she could actually be attempting to hide her pregnancy."

Mary-Kate Olsen has been dating artist Nate Lowman since early this year and is said to have been inspired to start a family by her friend, Heath Ledger - who told her that becoming a father was the most rewarding thing he had ever done.

A source added: "Mary-Kate really took Heath's words to heart. She wanted the same kind of fulfillment in her life that Heath found in his after becoming a dad."

But is she really pregnant by Nate Lowman, or are we jumping the gun based on her consumption of the occasional cheeseburger? What do you think?