The 24-year-old fashionista was spotted just a few days ago with her signature blonde hair and visibly dark roots. But now she's showing off a more sultry look with rich, chocolate brown locks.
Dressed in a black blazer, bright white scarf, stacked bracelets, and a Fendi croc handbag, this trendy twin joins another Hollywood celeb -- Jessica Biel -- in making a statement for fall with a darker 'do.
And who can blame them? They look fabulous.
No doubt Olsen knows how to pull off the brunette look -- just look at those bright red lips! And we are especially glad that she is emerging into a more sophisticated style.
Do you remember the extreme neon-dyed tresses she rocked over the summer?
Are you considering going darker with your hair this season? Leave a comment below telling us what you think of this Olsen sister's new hair color.
Check out these hair tips on getting bolder with your locks.