You know what they say — age is just number — and that couldn't be more true for many celebrity relationships. In early 2018, the gorgeous "America's Got Talent" judge Heidi Klum started dating 28-year-old German rocker Tom Kaulitz, who's more than 16 years her junior. But the age difference hasn't stopped them from loving and laughing one bit. (Heidi's also 13 years older than her previous boyfriend, art dealer Vito Schnabel.) Keep reading to see what other female stars have dated or married younger men.