"You know who is the best who ever did it? Princess Diana," she said. "She was like - she killed it. Every look was right. She was gangsta with her clothes.
"She had these crazy hats. She got oversize jackets. I loved everything she wore."
The Diamonds singer revealed that she draws inspiration from the late Princess of Wales in an interview with US Glamour.
The 25-year-old global superstar also spoke about where she got her passion for fashion from.
"My love for fashion—let me say, my admiration for fashion—started with my mom," the Bajan beauty said.
"I used to watch her get dressed. She was around my age right now, and she was so fly. So fly."
The glamorous songstress also revealed that she wasn't always so stylish.
"I remember not even knowing how to do that because I was such a tomboy," she said.
Last month Rihanna unveiled her second collection for British high street retailer River Island.
The Barbados-born singer's Autumn/Winter 13 range for the British retailer has the same urban feel as her debut collection, although a 'sporty chic' vibe has also been introduced.
The singer's love of tight-fitting outfits is reflected in the array of bodycon mini dress, tiny hotpants and crop tops.
See gallery of Princess Diana's maternity style