Alexis Denisof and Alyson Hannigan Celebrate 20 Years of Marriage

Alyson Hannigan and Alexis Denisof, who starred together in "Buffy the Vampire Slayer" and "How I Met Your Mother," respectively, celebrated their 20th wedding anniversary on Wednesday.

The couple, who met on the set of "Buffy" in 1999, married in 2003 and have two daughters together. Hannigan shared a sweet tribute to her husband on Instagram, writing, "Happy 20th anniversary to my love! I can't believe it's been 20 years since we said 'I do.' It's been the best 20 years of my life, and I can't wait to spend the rest of my life with you."

Denisof also shared a loving message to his wife on social media, writing, "Happy 20th anniversary to my best friend, my love, and the mother of my children. I love you more than words can say." The couple's friends and fans took to social media to congratulate them on their milestone anniversary, with many sharing their own memories of the couple's wedding day.