Be sure to check out the PM's super serious face at :25.
But, despite all his apparent properness, turns out Cameron was quite smitten. Not long after the trio's performance the world leader took to Twitter to post a cute pic of the girls with a brief note about their meeting.
And it looks like Prime Minister Cameron is also pretty pumped about debut LP, Days Are Gone!
Apparently PMs get hotly anticipated albums early. But don't get too jelly, us plebs only have to wait till tomorrow to get it in our paws!