Jon Cryer's ex-wife might have to start drinking discount champagne -- TMZ has learned, she just got shut down in court after asking to increase her child support from $8,000 per month to $88,000.
TMZ broke the story ... Sarah Trigger ran to court in October, crying for WAY more child support money because their son Charlie couldn't afford all the trappings of rich kid life when he was with her ... expensive summer camps, exotic vacations, fancy birthday parties.
Sarah claimed their son had become a laughing stock at the ritzy Buckley School because of his pauper lifestyle ... and he's humiliated.
She justified her bid by claiming her custody share had increased from 4% of the time to 50% of the time ... so she deserved more money ... especially because Cryer's making a killing on "Two and a Half Men" (she claims $2 mil a month).
But today in court, the judge wasn't sympathetic ... ruling there was no change in circumstances that required an increase in support. Translation: get off the gravy train and start couponing, lady.