If we didn't know better, we'd think Taylor Swift was part of the marketing team for British singer-songwriter Ed Sheeran. Swift loves his introspective music so much, she's been promoting it to her own fans. Her latest Viddy post is a clip of Sheeran and Swift singing his hit 'Lego House,' just one day before Sheeran's record '+' arrives in America.

Swift wrote, "Ed Sheeran's album + comes out June 12 and it's my favorite record right now-- go get it!!" The accompanying video is just a tease, with 15 seconds of footage of the pair singing 'Lego House.' Sheeran takes the lead vocal, while Swift add harmony during the chorus, "I'm out of sight, I'm out of mind / I'll do it all for you in time / And out of all these things I've done I think I love you better now."

The clip may have been recorded last month when the two young stars got together to write songs. Swift, 22, has been a star in the U.S. since she released her self-titled debut six years ago, while the 21-year-old Sheeran earned raves reviews after ‘+’ dropped in Britain last year.

'Lego House' hit No. 5 in the U.K., becoming his third straight Top 10 hit there. Sheeran recently had the honor of performing for the Queen of England. Swift has been writing songs for album No. 4, which could come out later this year.

Watch Taylor Swift and Ed Sheeran Sing 'Lego House'