Kate Upton was upstaged by her own ass at her 24th bday party in NYC Wednesday night -- hitting up the bash with her MLB star fiance Justin Verlander in a see-through outfit.
The Detroit Tigers pitcher was all smiles as he walked Upton into the bash at The Blond lounge -- and it's obvious why.
Huge stars like Bella Hadid and Nick Jonas also hit up the party ... wearing WAY more clothes.
Cheers to the bday girl.
Waiting for your permission to load the comments.