Christie Brinkley is double vaccinated and not wasting any time! The mother-of-three has been making the most of her newfound freedom and has attended several gatherings – including a Great Gatsby-themed birthday party.MORE: Christie Brinkley displays all-natural beach look for important reasonSharing pictures of the fun night out, Christie told fans: "It's good. Isn't it grand? Isn't it great? Isn't it swell? Isn't it fun? Isn't it? Nowadays...