Beatriz Colon / HELLO!: Heidi Klum's youngest daughter Lou's personality shines as mom marks 16th birthday with unseen family photos - In addition to Lou, the America's Got Talent judge is also a mom to daughter Leni Klum, 20, and sons Henry, 19, and Johan, 18 - It is an extra special, celebratory day for Heidi Klum and her family.