New college student Mary-Kate Olsen, 18, and boyfriend David Katzenberg, 21, have broken up, a source tells People.

Olsen and Katzenberg, who began dating late last year, ended their relationship a week ago in Los Angeles before both flew east to attend college, she at New York University, he at Boston University.

"It was a mutual parting of the ways and amicable," says the source. "Being at different schools played a part. It's reasonable for her to start school fresh." Olsen's rep declined to comment on the relationship.

Olsen and Katzenberg, the son of DreamWorks cofounder Jeffrey Katzenberg, were first spotted kissing in December and were soon seen out and about in Los Angeles, attending Lakers games and going to clubs together. Katzenberg remained by Olsen's side during her recent battles with an eating disorder.