Watch: Taylor Swift and Fetty Wap performing 'Trap Queen' together live.

The latest of Taylor Swift’s special-guests that she’s been trotting out on The 1989 World Tour, is known other than American rapper Fetty Wap.

The unlikely combo came together tonight for a joint rendition of 'Trap Queen'.

Watch the performance below...

Better clip of Trap Queen tonight with @fettywap #1989TourSeattle pic.twitter.com/bCQQXHZwa8

— Taylor Swift NZ (@TSwiftNZ) August 9, 2015

Taylor singing Trap Queen #1989TourSeattle pic.twitter.com/cKh4ipzWjp

— Hardcore Swiftie (@Swift13Updates) August 9, 2015