Country-pop hitmaker Taylor Swift recently teased that she had teamed up with Diet Coke for an "extraordinary" project and it has finally been unveiled.

The 'I Knew You Were Trouble' songstress shared a 30-second commercial earlier today for the beverage and it shows her writing lyrics to her hit single '22' while other people sing along to it in different scenarios.

Speaking about the working collaboration back in January, Swift explained that she was thrilled to be a part of the soft drink company's advertising campaign: "We've been in conversations about this partnership that's going to include so many fun things having to do with the tour, having to do with Diet Coke in general - behind the scenes for a commercial shoot."

"I really can't wait to begin all this and I think it's going to be an extraordinary ride. I just wanted to tell you guys first because you guys have been so amazing - thank you for everything and I'll talk to you soon."

It will air this evening in America (April 11) during 'American Idol'. Watch the commercial in full below: