Lady Gaga sang two songs on the David Letterman show last night you know

Lady Gaga had a bit of a singsong on David Letterman last night and the results of all that are now online.

Filmed from the Roseland Ballroom in New York where she's midway through her residency, the 'Venus' hitmaker not only did current single 'GUY', but also did 'Dope' at a piano while wearing a giant green wig and a top made of roses.

Here's 'GUY'.

And here's 'Dope'.