Justin and Selena doing a Duet together?

Justin and Selena are already major superstars, and they are dating, so why shouldn't they make a duet? According to the Dailyfill, Selena tells M Magazine that doing a duet with Justin would be a great idea! But that was before they were dating. Now, according to Eonline, Selena now changes her opinion about doing a duet with Justin. Selena says she tries to keep her family and her business apart, because it doesn't really work out as well. She feels pretty open about it, but she doesn't feel sure about doing a duet with Justin will turn out good or not. What do you think about them doing a duet? Should they do a duet? If not, who would you rather see them work with? COMMENT!