LOS ANGELES (UPI) – Karrueche Tran thinks ex-boyfriend Chris Brown should man up. The 27-year-old model slammed the 26-year-old rapper Sunday on Instagram after Brown criticized her for discussing their relationship in an interview with Access Hollywood. Tran broke up with the star in March after discovering he fathered a daughter named Royalty. “Honestly, it’s so [expletive] pointless to keep doing […]