MTO WORLD EXCLUSIVE: Reality Star Natalie Nunn MayBecome Rihanna’s SISTER IN LAW . . . She’s Dating Rih’s BROTHER!!! (Pics)

: Well, you know when thy say . . . you CAN’T choose your family. Well Rihanna’s not gonna like her potential new sister in-law.

According to a ROCK SOLID insider, Rih’s brother Roary is SERIOUSLY dating reality star Natalie Nunn. How seriously?

Well Roary flew her to Barbados where they spent the weekend together. And word on the Bajan streets is that he’s SO SMITTEN by Natalie that he may PROPOSE!!!