<Li> Group performance: "Flashdance...What a Feeling" (all finalists) </Li> <Li> Musical guests: Rihanna ("What's My Name?") and Christina Aguilera ("Express") </Li> <Table> Contestants' performances on the tenth live show <Tr> <Th> Act </Th> <Th> Order </Th> <Th> First song </Th> <Th> Order </Th> <Th> Second song (duet) </Th> <Th> Result </Th> </Tr> <Tr> <Th> Matt Cardle </Th> <Td> </Td> <Td> "Here with Me" </Td> <Td> 5 </Td> <Td> "Unfaithful" (with Rihanna) </Td> <Td> Safe </Td> </Tr> <Tr> <Th> Rebecca Ferguson </Th> <Td> </Td> <Td> "Like a Star" </Td> <Td> 6 </Td> <Td> "Beautiful" (with Christina Aguilera) </Td> <Td> Safe </Td> </Tr> <Tr> <Th> One Direction </Th> <Td> </Td> <Td> "Your Song" </Td> <Td> 7 </Td> <Td> "She's the One" (with Robbie Williams) </Td> <Td> Safe </Td> </Tr> <Tr> <Th> Cher Lloyd </Th> <Td> </Td> <Td> "The Clapping Song" / "Get Ur Freak On" </Td> <Td> 8 </Td> <Td> "Where Is the Love?" / "I Gotta Feeling" (with will.i.am) </Td> <Td> Eliminated </Td> </Tr> </Table> <Tr> <Th> Act </Th> <Th> Order </Th> <Th> First song </Th> <Th> Order </Th> <Th> Second song (duet) </Th> <Th> Result </Th> </Tr>

Who did one direction sing a duet with in the final of x factor