Looks a lot like

I think she looks like Kristin Davis

Looks like sisters. Rachael and actress Alicia Vikander.

https://onandbeyond.files.wordpress.com/2012/09/rachael-leigh-cook1.jpg

http://cdn.inquisitr.com/wp-content/uploads/2015/05/Alicia-Vikander-665x385.jpg

they look alike and they look enough alike to be sisters but they don't look enough alike to be twin sisters or to get one confused for the other.

an older rebecca black

Uhhh, no. The chick in the second pick is ugly and looks nothing alike.