Is this Wil Wheaton autograph fake?

As a pre-teen, Kim Holcomb had a giant crush on "Star Trek" and "Stand by Me" star Wil Wheaton.
She entered and won a Teen Beat contest in which she recieved an autographed t-shirt and it quickly became her prized possesion. But could it be a fraud?
Kim tracks down her childhood crush at Seattle's Emerald City Comicon to find out.