Seal fell for Klum when she was pregnant with daughter Leni (by ex-boyfriend Flavio Briatore), and he immediately stepped into the role of dad when she gave birth in May of 2004.
That December, he popped the question during an elaborate proposal in the Canadian Rockies.
"He took me by helicopter," Klum told Marie Claire in 2008. "He had an igloo built there, and they'd brought up everything: a bed with sheets inside the igloo, rose petals everywhere, candles. Very, very romantic!"
They tied the knot on a Mexican beach in May 2005, and kids Henry, 6, Johan, 5, and Lou, 2, followed. It didn't take long for their union to become a family affair.
"Each year, Heidi and I get remarried," he told Redbook. "It's a great party, but for about an hour, we go off on our own down to a private beach. We sit there with the kids and read vows to each other as the sun sets. It's a very special moment to us."
They captured another special moment in 2010, when they filmed a steamy, clothing-free video for Seal's song "Secret."
"It's the story of two people in love," Klum explained to Us. "My husband is what I always wanted and never thought I would have."
As we hope for the best for one of our favorite celebrity couples, let's take a look back at their romance ...