Add Facebook & Twitter Login to CakePHP Site

I have a social network built on CakePHP that uses basic email/password registration. I would like to add the option for the user to login/register using their Facebook or Twitter account. New users registering via Facebook or Twitter will need to select a password before completing registration to allow them to login with their Facebook/Twitter email at a future date. Our site also uses profile pictures, so the initial login and registration for the user will save and use their Facebook/Twitter profile picture.