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I honestly don't think so. I am very sorry but it doesn't look like other IPs ive seen.....

Unfortunately that is a VERY BAD forgery, here is what Zac's autograph looks like, this was obtained Via-Venue filming of his new movie "The Lucky One"
Zac Authentic Autograph

Sorry! I know you are waiting to hear back from him from "The Lucky One" too, so good luck
-Nicole

His signature has changed recently. Here's a guide to his two different authentic signatures--hope it's some help to you.