Heidi Klum, Leni Samuel, Henry Samuel, Lou Samuel in NYC

Heidi Klum and her mom, Erna Klum, took Heidi's kids along for a stroll in Manhattan on Friday. Leni, Lou, Johan, and Henry Samuel were close by mom and grandma's side as they took in the sights in NYC. Heidi took advantage of some time off from her busy schedule on Project Runway to head outside and enjoy Summer in the city. Heidi and her fellow judges started taping episodes for the show's upcoming ninth season in Battery Park late last month. This year will feature Kim Kardashian as a guest judge, and Zoe Saldana and Christina Ricci are among the other famous faces also rumored to be making appearances. Project Runway debuts on July 28, and Heidi has been stripping down to promote the new episodes, posing sans her shirt in the latest ads for the show. Heidi is topless on the current cover of Glamour, as well, and once again proves she's not shy about much in the accompanying interview, opening up about her sex life with Seal.