Brian Austin Green gave fans a reason to celebrate when he made his return to the Dancing with the Stars ballroom, just not in the way they expected.MORE: DWTS' Brian Austin Green's home with girlfriend Sharna amid Megan Fox divorceInstead of returning to compete with his girlfriend and professional partner Sharna Burgess, he made a cameo for the show's Halloween episode.The actor appeared on the sidelines of the show, cheering on the contenders left in the competition, with his partner by his