15 celebrity couples with huge age differences between them

Megan Fox and Brian Austin Green: 13 years

MeganFox and Brian Austin Green: 13 years

Megan Fox and Brian Austin Green at the 2014 Ferrari 60 Years In America celebration.Jonathan Leibson/Getty Images for Ferrari North America

Fox, 31, and Green, 44, met on the set of "Hope & Faith" when she was 18. They became engaged in 2006 and they reportedly split three years later, but then the couple married in 2010. Fox filed for divorce in 2015. But by 2016, the couple was back together. They have three sons, and Fox is a stepmom to Green's son from a previous relationship.