Ariana Madix & Other 'Vanderpump' Stars Donate Big to Friend with Bra

Ariana Madix opened up her wallet big time to help out a friend of the 'Vanderpump Rules' family ... this after a major health scare that's threatening their life.
AM was among several 'VP' stars to draw attention to the GoFundMe page of Jesse Montana -- who's a pal of theirs and who's appeared on the reality show. He recently revealed he's been diagnosed with a brain tumor, and he's looking to raise funds for his hospital stay ... 'cause he's going into surgery on Monday.

Like we said ... a lot of the 'Vanderpump' cast members have donated, but Ariana has shelled out the most by far -- offering up a $9,000 donation to help Jesse.
In hopes that Jesse's unexpected health woes don't leave him with a financial burden, the GFM page has a goal to raise $100,000.
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