Heidi Klum had her kids Leni, Johan, Henry, and Lou Samuel along for a walk around NYC yesterday. Heidi wore a peek-a-boo knit top over a black bra as she and the children enjoyed the hot weather. The Klum-Samuel family has been hanging out in the Big Apple lately while Heidi gears up for the debut of Project Runway's ninth season. Heidi has been busy with the reality series, which debuts later this month on July 28, but still takes time to keep her supermodel figure in shape. Heidi and Miranda Kerr went on a jog together last week as Heidi promotes her Summer Run series, designed to encourage female friends to team up as they work on their fitness.