Giving a celebrity my number?

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I'm meeting Steve-O this weekend. I met him last year as well. We talked for a good while. And he direct messaged me on twitter; obviously I was starstruck. I have an unusual crush on him. I know I'm going to talk to him Saturday. I want to treat him like a regular person, but I want to have enough guts to give him my number. He's not an A-lister so I don't feel like I'm shooting for the stars. He's a really cool dude and I just get really nervous when I actually get there. I don't think I'll ever meet him again. I'm driving over 250 miles from my home to go see him this weekend. I want to at least try. How can I do it without being overly creepy? I'm going to his last show of the night, and he's staying in Nashville for another night because he has shows on Sunday, any suggestions?
Also, why not try if I have the opportunity? This isn't an everyday thing!