MICHELLE PFEIFFER and JOHN TRAVOLTA

Travolta plays larger-than-life mum Edna Turnblad in the film, and spent all of his scenes sweating in a fat suit under layer upon layer of heavy make-up.

And when Pfeiffer told producers she felt sorry for her co-star after her own recent make-up mess, they begged her not to repeat her story to Travolta.

Producer CRAIG ZADAN explains, "She had just done this other movie where she played a witch, and she had a lot of prosthetics. And she said, 'Oh my God, I got rashes...'

"I said, 'Please don't say anything, I beg you... If you walk in and tell John about your rashes and stuff we're in really big trouble.'"

Source: WENN