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Heidi Klum, Lou

247PapsTV/ Splash New

Heidi Klum's boyfriend Martin Kristen is proving he's up for family fun.

The cute couple hit a local NYC water park today with her whole brood of kids for a day of family fun.

Klum, wearing sunglasses, black tank and printed black and white skirt, played with adorable 3-year-old daughter Lou on the swings, pushing her and pretending to nibble on her feet at one point as little Lou laughed and smiled.

Too cute!

Klum also watched her beau supervise her little ones as they played in the water. Klum's sons Henry, 8, and Johan, 6, played in the sand together before rock climbing with some friends.

Last week, Klum and Kristen, who began dating at the end of last year after her split from Seal, enjoyed a jog around the city together sans her family.