Kate Upton is FURIOUS Justin Verlander didn't win the A.L. Cy Young Award -- sending a scorching note to the MLB writers who voted on it ... YOU F**KED MY FIANCE.
Verlander came in 2nd in the voting behind Red Sox pitcher Rick Porcello -- despite the fact Justin had more 1st place votes.
FYI -- the Cy Young voting system is weighted. Writers fill in a name for 1st, 2nd, 3rd, 4th and 5th place -- a 1st place vote is worth 7 points. 2nd is worth 4, 3rd is worth 3, 4th is 2 and 5th is 1.