CMT Music Awards 2009 air Tuesday, T-Pain and Taylor Swift could duet

Rapper T-Pain will reportedly collaborate with country music songstress Taylor Swift during Tuesday's 2009 CMT Music Awards.

CMT has released promo photos of the pair together, but fans don't know if they'll be singing or simply doing a comedy sketch.

The show, hosted by comedian Bill Engvall, airs 8 p.m. Tuesday on CMT. The network's Web site will also stream the show live from Nashville's Sommet Center.

The performance lineup also includes Toby Keith, Brad Paisley, Sugarland, Keith Urban, Rascal Flatts and more.