Demi, 22, and Wilmer, 35, first got together in 2010, and reunited after splitting in 2011. Just two weeks ago, Demi took to Instagram to wish her man a happy birthday by posting black-and-white pics of the couple through the years.
"Here's to many more incredible years together," she wrote. "Happy Birthday my love.... I love you ❤️❤️❤️"