Kourtney Kardashian: Mason Has Best Beach Body!

Sisters host grand opening of bikini store and dish about how they're getting ready for swimsuit season

Kim, Khloé and Kourtney Kardashian are adding "bikini designer" to their résumés.

Last night, the sisters hosted the grand opening of BeachBunny swimwear in L.A. to talk about their designs and how they're getting beach-ready.

Kim's cutting carbs and sweets for swimsuit season.

Asked which guy has the best beach body, Kim couldn't think of an answer. "I don't know, but if you find one, tell me!" the newly single sister said.

But Kourtney immediately had a boy in mind...

"I think…Mason!" she joked, referring to her infant son. Kourtney also said her little boy has been "laughing and rolling over a lot."

"The other night, we were at dinner and Lamar was holding him and making him laugh. He laughed so hard that he was like, drooling on himself and Lamar," Khloé added.

Speaking of her Laker hubby, Khloé raced off to the Staples Center right after the party to watch her man's team win.

Lamar even tweeted a pic of the happy twosome postvictory.

Kim headed to dinner at Soho House with Eva Longoria Parker, who launched her fragrance at Beso earlier that evening.

And we're guessing Kourt headed home to tuck her little guy with the best beach body into bed!

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Kim's been quite the social butterfly lately. See who she stepped out with Monday night!