Olsens' Snow storm

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.' "

Snow could cause a further rift between the two sisters as he is now rumoured to be engaged to the actress.

When Mary-Kate turned 21 earlier this month he gave her a vintage Hermes Kelly bag and two days later during a lavish party at her Hollywood home, he slid a diamond "promise ring" on her finger in front of friends and family. It was allegedly a Snow family heirloom with rose-cut diamonds set in platinum.

A source told In Touch Weekly magazine: "Mary-Kate and Max are very serious.

"They're practically living together and will probably get engaged before the end of the year. She loves Max so much."

Mary-Kate's representative denies Snow gave her a ring.