Tampa Bay Lightning star Mikhail Sergachev is clearly winning both on AND off the ice … check out how his GF reacted to his Stanley Cup victory Monday — she was crying tears of joy!!

Elizaveta Fedotova — a smokin’ hot yoga instructor — posted footage of her watching her BF win his first-ever NHL championship … and it’s pretty touching.

Fedotova was catching the game on a small laptop … and when the Lightning sealed the 2-0 victory to give them the series win over the Dallas Stars — she started bawling!!!

“Simply the best morning this year!” she said in a caption after the win on a photo of a celebrating Sergachev. “My love! My champion.”

Fedotova also posted a picture of her FaceTiming with the Lightning defenseman right on the ice after the win … and it’s adorable.

The two have been dating for years … and they seem to have an amazing relationship — Sergachev has even posted about how he takes yoga classes with her.

Great time for the 22-year-old, huh?!