Mariah Carey teases about new music

Mariah Carey has revealed that she is back in the recording studio.

The five-time Grammy-winning songstress - who made a surprise visit to London where she met some fans - dropped hints that a new track could be expected later this summer.

"Still working in the studio with friends o plenty! I love love this new song :)" she tweeted.

She also teased fans that a new album could be on the way, when she wrote: "Summer 2012... Been in the lab, mixing up some concoctions for you, hope you like it!!"

Mariah, who last starred in Lee Daniels' Precious, released her 13th album Merry Christmas II You in 2010.

The 42-year-old has been enjoying motherhood with one-year-old twins Monroe and Moroccan with presenter husband Nick Cannon, whom she married in 2008.

But she still found time for music as she collaborated with Justin Bieber for the re-release of her Christmas hit, All I Want For Christmas Is You, last December.