Goldie Hawn loves to make every day fun, and she certainly knows how to celebrate!MORE: Goldie Hawn supports famous daughter-in-law during emotional end of an eraTo mark her beloved pet dog Rupert's birthday, the Hollywood star treated him to a cookie and dog-friendly ice cream and dressed the birthday boy up in a party hat.The Hollywood star shared footage on Instagram of her singing Happy Birthday to her beloved pet while lounging outside in her sprawling garden in LA. VIDEO: Goldie Hawn