Photos: Rihanna Turns Her Grandmother's Birthday into a 'Thug Party'

Rihanna's obsession with the "Thug Life" becomes more evident each day. Over the weekend, RihRih helped her dearest granny celebrate her birthday at home in Brooklyn. After a quick Whole Foods run for party supplies, the Bajan singer stopped by her humble abode for some family time. But it wasn't long before Rihanna turned it up with a thuggish photo session. Check out the thug transformation of her grandparents.