Klum opens about her "super romantic" relationship with the Tokio Hotel founder and guitarist — and how they keep things hot — in PEOPLE's exclusive cover interview

Heidi Klum and Tom Kaulitz’s sizzling chemistry is evident in every social media post, but their magical pairing almost didn’t happen. Klum, who is set to return to Project Runway on July 31, didn’t expect to marry for a third time after two marriages: Ric Pipino from 1997 to 2002,

Klum also revealed that age doesn't necessarily mean that one person knows more than the other. "When our door closes at home and when we’re good, I don’t really care so much