Troubled singer Rihanna strutted out of her London hotel wearing a black crop top emblazoned with the word ‘SLUTZ (at least she knows what she is). Rihanna was accompanied by her ever present weed-carrier-slash-assistant, Melissa Forde. The 25-year-old “Pour It Up” singer surprised fans when she joined her mentor Jay Z and singer Justin Timberlake onstage at the Yahoo! Wireless Festival in London on Sunday, July 14th. Insiders are whispering about Rihanna’s alarming weight loss. She reportedly smokes her weight in weed daily.