Derek Hough and his partner Hayley Erbert are couple goals and fans are often asking the pair about a possible engagement.MORE: Bruno Tonioli leaves fans saddened by latest appearance on DWTSThe professional dancers have been dating since 2015 and live together in a beautiful house in California.The Dancing with the Stars judge recently made a candid comment about popping the question to his other half in a tongue-in-cheek Instagram post.VIDEO: DWTS shock with elimination that might surprise