Mary-Kate and Ashley Olsen have let something come between them - a boy.

According to reports, Ashley is not a fan of MK's boyfriend, Max Snow. The wilder twin, famed for dressing like a bag lady, has been dating Max since she was dumped by Stavros Niachros for Paris Hilton.

But Ashley, the seemingly quieter of the two, has not been won over by Max's charms like her twin. She is said to be worried about Max's treatment of Mary-Mate, including his wild temper.

A source revealed, "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.'

Apparently, Max, yells at the tiny twin and Mary-Kate accepts it. The insider told In Touch Weekly that after Ashley was around for a fight, she became concerned.

The source said, "She 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.'"

The wealthy twins recently celebrated their 21st birthday.

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