Adele is sounding "better than ever" on her new album, according to her collaborator, OneRepublic frontman Ryan Tedder.

He's been working with the multi-million-selling songstress on the follow-up to 21, her second album and the best-selling record of the 21st century.

Tedder, who co-wrote tracks with Adele for 21 told the Herald Sun. "I love where she's at. She's still my favourite artist in the world.

"I would press pause on my entire life if it meant I could go into the studio for a month straight with her."

Tedder also revealed that he has been working with Beyoncé on her upcoming album. "And Beyoncé's album will be mind-blowing." he said.