Charlie Sheen‘s porn pal Bree Olson strangely thinks she has a shot at romance with the dysfunctional “Two and a Half Men” star. The bouncy blonde, who spent last weekend with Sheen and Michelle “Bombshell” McGee in Vegas, is telling friends Sheen is very interested in her. “She’s definitely seen him many times, but she thinks there is more,” a source said. “She doesn’t understand why he doesn’t get serious with his girls.” But it doesn’t sound like a match made in heaven. Last week, she was trying to shop a tell-all about him. Sheen’s rep didn’t back to us.