Ariana Grande has confirmed she is working on her second album.

“I've been in studio non-stop, so my voice sounds a little hoarse. But I'm working really hard on it,” the Nickelodeon star told MTV News US last night on the Grammy Awards red carpet.

“I've been working a lot with the producers that I did my last album with Harmony Samuels and Babyface and The Rascals and Tommy Brown,” Ariana explained.

“But, I've also been working with new producers like Max Martin; he's amazing. I love working with him. He's like a mathematician. He knows music like math. It just makes sense to him.”

The singer is also excited to be working with OneRepublic frontman Ryan Tedder, who has previously written for Beyoncé and Kelly Clarkson.

"We cut two songs together already. And he's amazing," she said. "I love working with him because he understands what it's like as a vocalist to want the song that day. He'll literally let me take two takes of something and then he'll have it done by the time I get out of the booth."

Ariana, whose debut album, Yours Truly, came out last year, also revealed she’s working on a top-secret collaboration with “An artist that she loves.”

“He asked me to feature on a song of his and I'm very excited about that. It's an unexpected collaboration but I think that's what makes it so cool," she teased.

But the pop star – who has an on/off relationship with The Wanted’s Nathan Sykes wouldn’t reveal who the mystery man is: "I don't want to say anything until it's recorded," she said firmly.