Mary-Kate Olsen Drops 170 Pounds ...

2/24/2010 7:47 PM PST BY TMZ STAFF
... in the form of her now ex-boyfriend Nate Lowman.

Mary-Kate Olsen and Nate Lowman


Mary-Kate and Nate had been dating since 2008 and are no longer together, according to Us Weekly.

The 23-year-old will now have more time to devote to her work ... whatever that is.