Leni rocked bright pink trousers and a royal blue blazer to match her mother's color-blocked combination.
'I know that being my daughter is not always easy. You never had the opportunity to grow up "normally". But what is normal? Growing up with three different daddies probably won't either,' she added.
Leni's biological father is businessman Flavio Briatore, but she was adopted by Heidi's second husband, Seal, when the couple were married.
Klum remarried nearly two years ago to Tokio Hotel musician Tom Kaulitz, 31.
'But you have the talent to get the best out of everything. And I would say: none of it harmed you - on the contrary: you are a self-confident young woman who fights for her goals,' she said. 'And even more important: you are a really great person with your heart in the right place.'