Heidi Klum is already one of the world’s hottest moms -- and  now she’s officially one of the coolest!

Wednesday night, the "Project Runway" host took her daughter Leni, 8, and her son Johan, 5, to see Justin Bieber in concert in Los Angeles.

While the supermodel was on mommy duty for the night, she had some extra help with the kids and navigating the crowds.

Heidi’s bodyguard beau, Martin Kristen, kept a close eye on the little ones during and after the show … and we’re sure he made the night more enjoyable for the blonde beauty as well.

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The 39-year-old wasn’t sporting any Bieber gear, but she looked rocker chic in a black blouse, black leather pants and black pumps. And the little ones showed off their Bieber fever after the show -- both donning the crooner’s concert tees. Afterwards, Heidi tweeted @justinbieber you were great!

By the end of the night, Klum’s youngest was seen sleeping in Martin’s arms as he was carried out of the concert.

From the looks of things, Martin definitely fits in with the fam and Heidi seems happier than ever! Click "Launch Gallery" above to see all of the pics from Klum's Bieber family date!

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