You are Vegeta’s wife in this

Beerus and Vegeta were fighting each other on your birthday, and when you walk over to Beerus trying to stop the fight, but he smacks you down.

This immediately enrages Vegeta, and he yells at Beerus.

“How... Dare you! THAT'S MY WIFE!”

He goes super Saiyan during yelling at Beerus, immediately continuing the fight with him and being stronger than Goku at this time.