Looks like...

Totally came here to say that. Watching the Person of Interest pilot and was totally convinced it was her!

I saw a glimpse of her in a commercial for her tv show "The Detour". I thought she was Blake Lively at first. Honestly based on her look in "The Detour" I would say she is a perfect older sibling to Blake Lively from the movie "The Town".

I was thinking Aly Michalka .... Surprised to find out there's a 14 year diff.