Heidi Kulm marks son Johan's major milestone

Hedi Klum is celebrating her son Johan's major milestone.

The 52-year-old model took to her Instagram account on Thursday to mark her 18-year-old son's high school graduation.

In the celebratory post, she posted a series of snaps and videos of the monumental moment.

In one video Johan can be seen walking proudly on stage to receive his diploma.

In the second clip, Klum who was wearing big sunglasses, sweetly gave her teenage son a kiss on his cheeks.

The proud mom also shares a snap of herself and Johan who is posing with his diploma.

Klum's 19-year-old son Henry can also be seen in the snap, with a beaming smile.

"Cheering you on today and every day," Klum wrote in the caption, adding, "CONGRATULATIONS JOHAN."

"My heart is full of joy and pride," the mom of four gushed.

It is pertinent to mention that Klum shares her kids Johan Henry, Leni, 20, and Lou, 15, with ex-husband Seal.

Seal also attended the Johan's graduation ceremony.