Mary-Kate and Ashley Olsen have fallen out over Mary-Kate’s new boyfriend Max Snow, it has been claimed.

The 21-year-old star is crazy about her new beau but her twin sister allegedly thinks he is bad news.

A source told Celebrity Babylon website: “Ashley never liked him from the get go, and now, as time has gone on, she thinks that he’s a bad influence on Mary-Kate.

“It worries Ashley that Mary-Kate is so passive around him, and lets him do the decision making.”

Ashley is also said to be worried by Snow’s temper.

The source said: “Ashley witnessed it for herself when Mary-Kate forgot to pick up something he wanted at the store. Max was screaming some awful and insulting things.

“Mary-Kate was teary-eyed and upset, but told Ashley ‘He does that a lot – it blows over.’ “