The "Work" hitmaker, who was seen out this weekend in the Big Apple, wore a baggy black t-shirt with the people's princess emblazoned on the front and the title "Princess of Wales", reported Daily Mirror.
She matched the head-turning top, which included the royal's birth and death years, 1961-1997, with a large leather jacket draped over her shoulders and thigh-high jean boots.
Rihanna, 28, accessorised with a chunky gold cross necklace, gold choker, designer shades, sparkling earrings and plenty of rings.
The superstar has gushed about the late princess in the past and revealed she was her biggest fashion inspiration.