WALK THE LINE star Reese Witherspoon is reportedly set to show off her singing talents again by collaborating with Michael Buble.

The actress won an Academy Award for her musical turn as June Carter Cash in the 2005 Johnny Cash biopic, and now she is said to be heading back to the recording studio.

According to Us Weekly, Witherspoon, who gave birth to son Tennessee James on 27 September (12), is in talks to record a duet with the Canadian crooner.

No details about the project have been confirmed.

Witherspoon previously admitted recording the soundtrack for Walk The Line was "the most challenging, horrifying experience" of her life.