Sunday was Father's Day, and stars took to Instagram to honour their dads as well as their own experiences with fatherhood. Celebrities such as Neil Patrick Harris, David Beckham, and Prince Harry — who is celebrating his first Father's Day since welcoming son Archie Harrison Mountbatten-Windsor in May — have posted sweet messages for the occasion, and they have 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 out how more stars are paying tribute to fathers!