It’s been weeks since we’ve seen Ashley and Mary-Kate Olsen pictured together and now we know why!

Souces say there is a serious rift in their relationship as a result of their different work ethic.

“Ashley really wants to be a respected businesswoman and be taken seriously,” says the pal. “MK does too, but she hasn’t been willing to give up her lifestyle and act like an adult for their job.” So Ashley has taken a drastic step: distancing her twin from the couture end of their joint fashion empire. “Ashley came to a difficult decision. She decided that MK should not be involved with The Row,” says the insider. “She asked her sister to step back from her current responsibilities until she has her personal life together.” Instead, MK will focus on their more affordable line, Elizabeth and James, for which their roles were always less hands-on. “It’s tough because The Row was so much of Mary-Kate’s idea,” says the insider.

As a result of this move, torn leggings and stained worker shirts will no long be a part of The Row collection.