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Rex Features
The actor and musician plays a music-loving nerd who falls for Hudgens's quirky misfit in the upcoming battle of the bands comedy.
Speaking to E! Online, he said: "Vanessa's kiss was like day five of the shooting, and I had just met her. I'm like real nervous. I'm kind of like freaking out.
"When I get nervous, the blood leaves my hands, so they get that weird tingly feeling. So, I'm sitting there, trying to shake them. She kind of looks at me like, 'Gaelan, why are you freaking out?' And I'm looking at her like, 'Oh, come on - like you're really into this?'"
He added: "Thank you Shia LaBeouf and Michael Cera for paving the way for someone like me to be the leading guy in a movie - revenge of the nerds!"
Bandslam, which also stars Alyson Michalka and Lisa Kudrow, is released next week.
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