Heidi Klum is celebrating her daughter Leni’s big day!

The 51-year-old model took to her Instagram account on Sunday, May 4 to mark her daughter’s 21st birthday with adorable throwback snaps of Leni.

In the celebratory post, the proud mom penned a loving tribute for Leni, expressing her love for her daughter.

“Happy Birthday Leni,” Klum wrote a warm wish.

“I love you with all my heart,” she gushed.

As Klum closed her caption with a heart emoji, she also posted Leni’s childhood picture which appear to be her snaps after Leni’s birth, as Klum can be seen laying on a bed in a white dress while embracing the baby Leni.

The Project Runway star gave a sweet kiss on young Leni’s head who was donning a white dress with pink dots on it.

It is pertinent to mention that Klum shares Leni and three children, Lou, 15, Henry, 19, and Johan, 18 with her ex-husband Seal.

Klum and her Seal finalized their divorce in 2014 after partying ways in January 2012.

The model is currently married to Tom Kaulitz, who calls him an “extra dad” to her kids.