Ariana Grande and Big Sean are getting an early start on holiday romance. On Saturday, Big Sean posted pictures of the couple embracing and kissing passionately backstage at CBS's A Very GRAMMY Christmas Special concert, which was filmed on Tuesday and airs on Dec. 5. "Me n my Ari," he captioned the snap. The sweet moments continued on stage, with the couple stealing the spotlight with cute PDA while performing their duet "Best Mistake."