Kaley Cuoco is ringing in her 30th birthday with a roar. The Big Bang Theory actress celebrated her special day in Mexico City at an animal sanctuary. The TV star snapped a picture with a tiger cub, captioning the photo, "Surrounded by my best friends and all the lions and tigers I can count! #IThinkThisMustBeHeaven". The blonde beauty shared other pics of her gushing over the animals, as well as group shot with her best friends saying, "Serious squad goals. Twelve BFFs on a trip of a lifetime."