"Duos & Deception" is the sixth episode of Season Four of the sitcom Austin & Ally. It aired on .
Ally spins a chore wheel so everyone has something to do while the health inspector is in town. When Trish books brother–sister duo Bobbie and Billie, the A&A Music Factory gets a lot of attention. They have trouble figuring who is Billie and who is Bobbie. Problems with the store begin arising, such as there being ketchup and mustard in the instruments and a rat infestation. Ally starts blaming Austin, Trish, and Dez for this. While Austin and Ally are cleaning downstairs, Billie and Bobbie tell them to go and get something to eat. Billie and Bobbie tell Trish and Dez that Austin and Ally have gone so they go to the mall and ask them why they are here. They say that Billie and Bobbie told them to. They then know that Billie and Bobbie are playing them. They ask Lily if she knows anything, and she tells them that Billie and Bobbie are opening the B&B Music Factory next door. Trish says the best way to get back at them is in front of a live-streamed audience. Austin and Dez tell Billie that Bobbie said she was the star of the show. Ally and Trish tell Bobbie that Billie said he is the star of the show. The two argue in front of the audience and then storm off. Dez and Lily sing the Billie and Bobbie theme song while replacing Billie and Bobbie with Dezzy and Lily. In the end, Billie and Bobbie apologize for their actions.