Justin Bieber collaborates with Taylor Swift

After Justin Bieber’s surprise appearance at Taylor Swift’s Los Angeles concert on August 23, the two stars have decided to team up to write a song together, reports Teen Music.

The young stars thrilled fans with a surprise duet during the country singer’s concert. A week later came the Tweet from Grammy-winning producer Thaddis ‘Kuk’ Harrell.

“Wow!! Got to see Justin Bieber & Taylor Swift write a song together last night!! Smash!!!! Smash!!! Smash!!! Let’s do it again y’all!!!”

Harrell, who appears to enjoy overusing exclamation points then messaged Swift, winner of last year’s much-coveted songwriter of the year award in Nashville: "You and Justin killed that writing last night!!! Smash!!!!!!!"

Currently, no other details has been released, although Bieber did reveal earlier this week that he was working on a Christmas album that will raise funds for charity.

As for this new songwriting team: Jus-Tay or Bie-Swift? You decide.