Justin Bieber writes song with Taylor Swift
The 'Baby' hitmaker - who is currently dating the 'Love Story' singer's best friend Selena Gomez - have written a track together in the studio according to Harrell, who has worked Rihanna and Katy Perry in the past.
He wrote on twitter: "Wow!! Got to see @justinbieber & @taylorswift13 write a song together last night!! SMASH!!!! SMASH!!! SMASH!!! Let's do it again Yall!!!"
Harrell wrote: "@taylorswift13 You and Justin Killed that writing last night!!! SMASH!!!!!!!"
Bieber and Swift's collaboration comes shortly after he made a surprise appearance on stage with her to perform his song 'Baby' with her as part of her 'Speak Now' tour gig in Los Angeles on Tuesday (August 23).
Following the concert, Taylor tweeted: "You think you've heard LOUD screaming in your life. Then @justinbieber comes out and does a surprise song during your show. Woah. Unreal."
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