Heidi Klum's daughter Lou was born for the runway 🥰 The German supermodel, 53, shared the sweetest throwback video of her youngest child – whose dad is superstar singer Seal – to celebrate her 17th birthday 🎊 "I love you so very much and I am so proud of you and everything you do ♥️" wrote Heidi. "Where has all the time gone?" 📽️ : #heidiklum