Sunday was Father's Day, and stars took to Instagram to honor their dads as well as their own experiences with fatherhood. Celebrities such as Neil Patrick Harris, David Beckham, and Prince Harry — who celebrated his first Father's Day since welcoming son Archie Harrison Mountbatten-Windsor in May — posted sweet messages for the holiday, and they had us smiling from ear to ear. "Happy Father's Day to the best there is!" The Big Bang Theory star Kaley Cuoco captioned a snap of her dad walking with her when she married Karl Cook last year. "This guy never missed a single taping of BBT and still comes to cheer me on at horse shows whenever he can. One of a kind!" Keep reading to see how more stars paid tribute to the fathers in their lives!