AceShowbiz - Mary-Kate Olsen is single again after splitting from her boyfriend Nate Lowman. The former child star, 23, has been dating Lowman since 2008 and the relationship was rumored to have turned serious in 2009, with reports suggesting the couple was planning a 2010 wedding.

A rep for Olsen dismissed stories of an engagement at the time, and now the pair has gone their separate ways. A spokesperson for the star confirmed the break-up to Us Weekly magazine, "No, they are not (together any more). It's been a while."

Before having a romantic relationship with Nate Lowman, Mary-Kate Olsen dated David Ketzenberg in 2003. However, she ended her romance with him a year after. The twin sister of Ashley Olsen later had a fling with Starvos Niarchos III, a Greek shipping heir, but they broke up after he was romantically linked to Paris Hilton.