I stumbled over this image of Blake Lively and thought, "Hey, she looks just like Alex in my head." The next thought was, "This girl looks familiar."
I just wished for her as Jenny in Undercover. Having the same actress for two characters might be overdoing it...
Next try, I ended up with Julianne Moore, but I can't imagine her as terrified and out of place as Alex is most of the time. If she was lost in space and time she'd probably be lost in a dignified way.