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Who knew Taylor Swift and Kendrick Lamar were fans of each other?!

T-Swift celebrated being the first artist to see an album sell over a million copies this year. Nielsen SoundScan is reporting that 1989 sold close to 1.3 million copies last week alone. She's the first musical act to ever have three albums sell a million copies in a week (the other two were Speak Now in 2010 and Red in 2012). 

So how did Tay celebrate? By lip-syncing to a Kendrick Lamar song, of course. In an Instagram video, Taylor lip syncs to Kendrick Lamar's "Backseat Freestyle." The best part was she actually was sitting in a car (it's not clear if it was actually the back seat though). 

Credit: YouTube

She captioned the video, "Industry experts predicted 1989 would sell 650k first week. You went and bought 1.287 million albums. AND IT'S GOT ME LIKE."

Meanwhile, in a new interview with The Fader, Kendrick Lamar revealed he was a fan of Taylor's ... and loves her song "Shake It Off." The rapper was captured singing "Shake It Off" during the interview and it's amazing! He says, "I love that song. 'Shake It Off.'" After singing Taylor's hit he says, "I ain't playin' ... I say what I mean, and I mean what I say."

Kendrick also mentioned that he appreciated Taylor's comments in a previous Rolling Stone interview, talking about how much she loves the rapper's "Backseat Freestyle." She told the magazine about the song, "You want to know a trick to immediately go from feeling victimized to feeling awesome? This is my go-to. I know every word."

Check it out below:

Photos: YouTube/Getty Images