Legendary actress Joan Collins is proving that age is nothing but a number as she dances to Pharrell Williams’ “Happy.” The glamorous star is soaking up the summer sun in style, reminding fans to embrace life’s simple joys. Joan Collins is embracing the summer spirit with pure joy on her vacation! The “Dynasty” star shared a delightful video on Instagram on Tuesday, July 16, featuring herself dancing in the pool to Pharrell Williams’ upbeat track “Happy.” At 91 years young, Collins was accompanied by her husband Percy Gibson, and her friend, director, and choreographer Paul Robinson, whom they…