Singing comes naturally to Carey

Mariah Carey says recording music is like "breathing" for her.

The American singer has sold over 200 million records worldwide. Her last album was 2010's Merry Christmas II You, which included four original tracks and several covers.

In 2009 Memoirs of an Imperfect Angel hit the stores, which was an LP of fresh material, and it seems she's now working on a new release.

The star has been laying down songs in the studio and says she couldn't be happier.

"Back in the studio for a minute... like breathing," she wrote on Twitter.

Carey also posted a picture of her singing in a black bandeaux dress, with her hands in the air as she apparently hits an emotional high note.

The star has been taking things slowly following the birth of her twins Moroccan and Monroe in April.

She recently recorded a duet with Justin Bieber for his festive album Under the Mistletoe. They collaborated on a new version of her iconic hit All I Want for Christmas Is You.

She's also been selling her collection of shoes, jewellery and perfume on the Home Shopping Network (HSN). The star is delighted with how well her line has gone down with fans, and revealed her favourite items on the social networking website.

"I'm most excited about the sunglasses and the boots I designed for HSN. Tune in tomorrow! x0x0," she wrote on Sunday.

Carey's baby twins look set to follow in their famous mother's footsteps after starring in her new video with John Legend.

The singer recruited Legend for a remake of her song When Christmas Comes, which originally featured on her 2010 album Merry Christmas II You.

The stars shot the promo in California and now Carey tells Extra her six-month-old children, Moroccan and Monroe, feature in the festive film.

"When Christmas Comes, people need to hear the song; I think John Legend swung it home! I think the fact that the babies are in the video is great. I wrote a line in the song that says 'We're gonna laugh together as the children pl! ay' - it was cute because I was pregnant when I sang it and the babies are here now."