Mariah Carey taught a lesson about being a diva

MARIAH CAREY was forced to leave her infamous diva behavior at the door on the set of her new movie PRECIOUS – the director made her share a trailer with her co-stars.

The singer/actress has a small role as a social worker in the forthcoming movie, which has received rave reviews at the Cannes Film Festival in France since its screening on Friday.

And the film’s director Lee Daniels refused to allow Carey any special demands on set – and is sure the "deglamourizing" experience was good for the 39 year old.

He says, "Mariah had to share a trailer on set and was only allowed one bodyguard, not her usual entourage.

"It was hard for her to be deglamourized but I also think it was a growing experience for her."

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Hmmm…I guess change is good for all of us.  By the way, PRECIOUS looks like it may be worth watching.  Check it out.