Photography Proofing for clients?

Hey there,
I am a photographer looking for a way to post photos to my website in a password protected area.
More specifically, I would like to be able to add a tab labeled “clients”, once they click on that tab, it will bring them to a proofing section much like this: http://laurenlarsen.zenfolio.com/
Is this possible/ is there a plugin available to do this?

Thanks!
Mike
http://www.imthirdstudios.com