Kaley Cuoco was in a celebratory mood over the weekend as she marked the birthday of one of her good friends.The Flight Attendant star took to Instagram to share a series of fun pictures of the pair together in various settings, including a gorgeous photo of them posing on the beach.MORE: Kaley Cuoco shares glimpse at epic home bar inside LA mansionIn the image, Kaley looked stylish dressed in an oversized white blouse and skinny jeans, which she teamed with yellow-hued sunglasses. VIDEO: Kaley