J.Y. Park is checking out a sexy woman at the gym in his next teaser for "Who's Your Mama?" featuring 'Unpretty Rapstar,' Jessi.

He oh-so-casually gets on the treadmill next to the lady, checks out her behind, then not-so-creepily (but actually kind of creepily) asks her, "What's your waist size?" Rather than the normal response of giving him a weirded out side glance and scooting over to another exercise machine, she confidently says, "24."  She knows she lookin' good!

He goes on, "What about your hip?" and she says with a self-satisfied smirk, "34," leading J.Y. Park to go, "Ow!"

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Check out the humorous teaser video above and stay tuned for the fun release on April 12!