His other comedy credits include "How to Lose A Guy In 10 Days," "I Love You, Man" and "17 Again."
Now, Lennon is in "Bad Teacher."
"I'm in a movie with Justin Timberlake and Cameron Diaz. I'm the only person with his clothes off in it, by the way," he said. "They have a sex scene. Last time I checked, they're fully dressed. I have a sex scene with a Xerox machine, I'm fully nude.
"So you have to judge, is this a film you want to take your family to? Don't take your family to this movie at all. Take your really weird friends. Your pervy, pervy friends."
The comedy is rated R in part because of some of his scenes.
"I'm the perfect combination of a person who doesn't look that amazing with his clothes off who loves to do nudity, so I'm like a perfect storm of bad ideas," Lennon said.
When it comes to his career, it's clear Lennon and laughter are a team.