Tom Kaulitz, Heidi Klum. Spread Pictures/MEGA Heidi Klum appears to be aging in reverse. Klum, 51, showcased her bombshell body in a string bikini with cheeky bottoms while vacationing in St. Barts with her husband, Tom Kaulitz. The German couple, married since 2019, appeared deeply in love, holding hands and cuddling on the beach. Klum’s…