If you thought the Eminem-Elton John pairing at the Grammy Awards was odd ...

Taylor Swift has gone gangsta! The country darling is teaming up with rap superstar T-Pain for a top-secret collaboration that is rumored to be the opening number of Tuesday's CMT Awards. Taylor was even sporting some grillz at the rehearsal (see photo after the jump). She's up for four trophies, including the night's top award, Video of the Year, for 'Love Story.'

The CMT Awards air live from Nashville on Tuesday, June 16 at 8:00 PM ET. See a full list of nominees here.