Kourtney Kardsahian Feels Sexier as a Mom

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Kourtney Kardashian is one hot mama.

The E! reality star, 31, tells UsMagazine.com she feels sexier since welcoming son Mason last December.

"It brings out a whole new glow or something," she said at the Beach Bunny Swimwear opening in L.A. Tuesday.

PHOTOS: Adorable shots of Mason!

Mason is a looker as well, according to his mom.

When asked who has the best beach body out there, she quipped, "I think Mason!"

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The four-month-old "has been laughing and rolling over a lot," adds Kourtney. "I love when he's hysterical and he laughs so hard."

Khloe Kardashian, 25, says her husband Lamar Odom, 30, loves playing with his nephew.

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"The other day, we were at dinner and Lamar was holding him up and making him laugh... and he just laughs so hard that he was drooling on himself