This memorable serenade was a thoughtful gift from Demi Moore, who also has two other daughters, Rumer Willis, 37, and Scout Willis, 35, with her former husband.
"My mom pulled off something incredible by facilitating this surprise, this gift, and Justin and I started laughing out of pure bliss," Tallulah continued. "I will never forget that moment.”
And as the couple exchanged vows they had written themselves, there "was not a dry eye out there," according to Tallulah.