Seal is celebrating a major milestone for his daughterLeni Klum – and getting a little emotional in the process. The singer, 62, shared a post on Instagram wishing his eldest daughter a happy 21st birthday over the weekend.

Alongside a throwback photo and his 2010 song Secret, Seal wrote, "21 Years Ago Today…..You held my heart and made me a better person by giving me the gift of a lifetime—the chance to be your dad. From the man who will love you forever, no matter what, HAPPY 21st BIRTHDAY LENI…Papa."

Leni responded sweetly in the comments "love you papa." She also got a birthday shoutout from her mom, Heidi Klum, who shared a carousel of photos from Leni’s childhood. “Happy Birthday Leni,” Heidi wrote in the caption. “I love you with all my heart.”

© Instagram

While Leni's biological father is Italian businessman Flavio Briatore, it was Seal who raised her. She was born on May 4, 2004. A year later, Seal married Heidi and legally adopted her in 2009, changing her name to Leni Olumi Klum.

"To me, it's irrelevant," Seal once said of Leni's biological paternity. "Anyone can father a child. Big deal. Raising the child is the key."

He added at the time that Flavio had no involvement in Leni's upbringing and credited him for not disrupting the family's setup: "He's clearly not a selfish man."