#4 – When people talk about Jay-Z and his mistresses, they often forget about a mainstay who has been there forever. She is the person he calls when he needs to be discreet and thinking about old times. She is that very short named R&B singer who hasn't had a hit in awhile and doesn't really even act or record any longer. She basically lives off the generosity of Jay-Z and a couple of other guys. She peaked at A-.