To the delight of her fans, Taylor Swift has just posted a candid Instagram video of her singing "Heartbeats" by The Knife with Cara Delevingne.

The video was captioned, "Me, Ed, Cara. Singing songs in the US ambassador's house. What is life," said Swift.

The three were featured in the short clip standing at the bottom of a staircase with Sheeran playing the guitar while the two ladies sing the lyrics, "One night to be confused/One night to speed up truth/We had a promise made/Four hands and then away," the famous friends sing. "Both under influence/We had divine sense/To know what to say/Mind is a razorblade."

Elle reports that the video was made at the home of the U.S. Ambassador in London.

Taylor, the I Know You Were Trouble singer harmonizes with Ed Sheeran, who is Taylor's best friend and opening act for her Red Tour and bush eye-browed model Cara Delevingne.

Taylor is dressed up for the home, wearing a short black dress matched perfectly with black tights. Cara on the other hand, was dressed down in model fashion wearing a loosely fitted shirt, jeans and a leather jacket.

Cara and Taylor are seen striking a pose with George Washington and add a little bit of youthful humor to their visit. The photo posted said, "Just trying to be like George Washington."

Both young celebrities are ex-girlfriends of One Direction singer Harry Styles and have been spending quite some time together. 19-year old British model Cara and 23-year old Taylor had some fun during the Victoria Secret Fashion Show in New York last November.

While performing, Swift tapped the bum of Cara as she strut past the singer on the runway, reports Mirror UK.

Just Jared reports that Taylor and Ed are presently in Europe for the last handful of shows for the European leg of the Red Tour. They have played three shows in London at the O2 Arena and will be traveling to Berlin for a show tomorrow night. They will then go back to London for two more shows before the tour is complete.