Heidi Fleiss has told RadarOnline.com that there is "no comparison" between Lindsay Lohan and Charlie Sheen.

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The famous former Hollywood madam -- who used to regularly supply hookers for Sheen -- claims people should just allow him to party as hard as he wants.

The Two and a Half Men star recently had a wild time with porn star Bree Olson and some of her pals in Las Vegas, raising fears that the troubled actor is in need of an intervention ASAP.