Heidi Klum is sharing her secrets to keeping the spice alive and getting past the infamous "seven-year itch" in her marriage to Tom Kaulitz. "It just comes naturally. ... There's no rule book to follow. I think it just comes naturally, or it doesn't," Klum, 52, exclusively tells Us Weekly while promoting her and Diplo's new single, "Red Eye," which is now available to stream on all platforms. Klum and Kaulitz, 36, tied the knot in August 2019 after less than two years of dating.