Taylor Swift was joined on stage by Brit singer Ellie Goulding to perform her hit Anything Could Happen at Taylor's Los Angeles show.
The 22 singer introduced Ellie to the stage as: "one of my favourite artists who is so cool and very talented," before belting out Ellie's hit.
The admiration is obviously mutual, as Ellie instantly instagrammed a snap of their performance when she came off stage with the caption: "So.much.fun. Love that girl."
Ellie captioned this picture "Beauty Contest," we can see why (Instagram)
Ellie and Taylor's playful antics carried on off stage as the Burn singer uploaded another pic of the two ladies pulling funny faces, which she sarcastically labelled as "Beauty Contest."
Whilst the pair's duet and apparent friendship may come as a surprise to many, last year Taylor explained that Ellie is one of her two British friends.
"I have two British friends. Ed Sheeran is one of my friends and I met Ellie Goulding and she's the coolest girl. I've been obsessed with her records for a really long time."
Taylor added: "I felt a little fan girl-ish because I was quoting lines from her songs and I was like, 'Where did you come up with that? What's the meaning behind that?' She was physically weirded out. I know all the words to her new song."
No doubt the performers had plenty to talk about, we wonder if Taylor was giving Ellie advice on how to handle the Directioners now she has become linked to 1D's Niall Horan?