Lindsey Vonn hit the MTV VMAs with a brand new accessory ... her massive new emerald engagement ring!!
The legendary skier just got engaged to her hockey superstar boyfriend P.K. Subban last week but she kept the ring on the down low ... until Monday night.
As you can see, the stone itself is BIGGER THAN HER KNUCKLE ... and while the price of the ring is still unknown, safe to say it ain't cheap! Good thing Subban is in the middle of an 8-year, $72 million contract!
Subban previously told Vogue he picked the emerald because green is Lindsey's favorite color -- and it also happens to be his birthstone .