Mariah Carey, pictured below leaving the Dorchester last night to appear on Alan Carr's Chatty Man show, is to switch on the Christmas lights at Westfield shopping centre this evening.

She will then celebrate the launch of her new album Memoirs of an Imperfect Angel at a Mayfair nightclub.

Yesterday, the pop diva angered This Morning host Phillip Schofield.

He launched a rant on Twitter when Carey turned up an hour late for an interview.

The veteran presenter posted a series of messages on the site when the American singer failed to show up on time.

He moaned: "Sitting here twiddling our thumbs waiting for Mariah Carey. la la la laaa."

Schofield later posted: "Her people have arrived!"
But apparently frustrated, the normally mild-mannered host later added: "She's just changing her mind about what she's wearing!" - following his sentence with a series of exclamation marks.

Carey's appearance was being pre-recorded on Monday and is due to be broadcast next week.

After meeting the star, Schofield changed his tune, saying: "To be honest, she was lovely and very easy to interview.

"She sang live and hit notes only bats could hear."

He Tweeted: "She was also suitably apologetic for being an hour late.

"And yes ... an entourage greater in number than the population of Denmark."