Taylor Swift is hard at work on her sophomore album, which will include a duet with folksie-pop singer Colbie Caillat.

"I recently wrote a song with Colbie Caillat, who's No. 1 on my 'Cool
People List'," Swift tells Dial-Global. "She's got this amazing album that I've fallen in love with, and I got the great opportunity to write a song with her. I've got this awesome tape of us both singing it, and I'm playing guitar and she starts singing these backup vocals and I'm like, 'Oh my God, she's got the best voice ever.' And so that's a really cool thing that I'm very excited about on this album."

Swift has also written a song with good buddy Kellie Pickler that will appear on Pickler's sophomore album. Swift's new album is due later this year.