8:34 AM PT -- 4/2 -- Ronaldo's armband officially has a new owner ... with an anonymous buyer shelling out $75,000 for the accessory!!
The auction didn't go off without a hitch, however -- the AP reports there were several large "fake" bids made to throw off the whole process, without success.
Authorities are currently looking for the people responsible for the fake bids and promise to hand down swift punishment.
The $75k winning bid will now go towards 6-month-old baby Gavrilo's treatment.
Awesome!