No one goes to their friend's birthday party and make the whole party about them - by crying that is. Selena Gomez did just that at Taylor Swift's recent birthday do.

According to UsWeekly, she's the one person you'd hate to call to your party because while everyone was having a great time, Selena started getting emotional and reportedly started crying and was heard shouting:

"She shouted, 'No one understands me! My boyfriend doesn't even understand me," an insider tells Us, adding that bystanders — including guest Sam Smith — "just stared [at her]."

Taylor Swift already told her to leave that blonde douche behind but she didn't listen.