Carly Rae Jepsen has admitted that she is "sworn to secrecy" over her collaboration with Justin Bieber.

The pair have performed together live in the past and they are set to work together in a studio setting for the 'Call Me Maybe' singer's upcoming album.

Speaking to MTV News, Jepsen said that the pair plan on unveiling the song together at the same time. She said:

"The Justin song, I'm kind of sworn to secrecy on because I think we want to release it together at one moment. But the rest of the album, I'm really excited for."

Jepsen did however mention one collaboration that she is allowed to talk about - 'The Kiss', which she wrote with LMFAO's Redfoo and Matthew Koma. She said:

"There's one particular song that I can't wait to share called 'This Kiss' that I wrote with Matthew Koma and Redfoo from LMFAO. [The sound is] definitely in my vein, but he's a really brilliant guy, and I think if anything when a collaboration happens, it's a little bit of everybody that makes it what it is. So maybe not just me and not just him, but us together."