Heidi Klum celebrated her husband Tom Kaulitz's 35th birthday in Zurich, Switzerland, with a joyful gathering that included Tom's twin brother, Bill Kaulitz. The couple, who met on the set of 'Germany's Next Topmodel' in 2018, shared the celebration at Lake Zurich and at the Icon Club, as Heidi expressed her love on Instagram. Klum, 51, highlighted Tom's thoughtful proposal that involved asking her children for permission, demonstrating his commitment as a stepfather to her four kids. The Kaulitz twins are currently filming the second season of their Netflix docuseries 'Kaulitz & Kaulitz' and preparing for a performance at the Super Bloom Festival in Munich. Tom ended his first marriage in 2016, while Heidi divorced her first husband in 2002. Their relationship continues to thrive despite their 16-year age difference.