Kelly Clarkson and Reba McEntire go waaaay back. Clarkson is set to wed Reba's stepson Brandon Blackstock this fall. The ladies released a duet single ('Because of You') in the past and toured together. They also partnered up for a CMT 'Crossroads' special. Now, they appear to be back in the studio together and they've drafted another country lady to be a part of their latest project: Trisha Yearwood.