Then you're going to LIVE for this video!!!
She's gone undercover -- and she OWNS it!
Ch-ch-check out the video for Birthday here (above)!
Lip smackin' LOLz!
And you'll never guess where they were dazzling us with their vocal stylings…
The US ambassador's house!
What a special impromptu gig to post on Instagram!
Swifty and Ed are currently on her Red tour, so this cute stopover was just a break before their Berlin show tonight and London later next week!
[Image via Instagram.]