Considering Mary-Kate Olsen has supposedly split from long-time BF Nate Lowman, she looked in surprisingly good spirits when we bumped into her and her sis in London this morning.

In fact, the normally miserable Olsen even cracked a smile for our photographer.

The 23-year-old designer and her boyfriend, who began dating in 2008, haven’t been together for “a while,” so her rep tells UsWeekly magazine.

MK and twin Ashley are currently in England for  London Fashion Week.