She said: "I love plasters. They are great for shoe blisters, as nipple covers and also for nail mishaps - people just think you have a cut."
Rihanna - who is rumored to be dating R'n'B singer Chris Brown - also admits she had a crush on her musical idol Mariah Carey when she was growing up in Barbados.
She added to Britain's InStyle magazine: "I was in love with Mariah Carey when I was younger. I thought she was flawless. I also loved Marilyn Monroe's timeless look. And I love everything Madonna does - she switches it up and that's what I like to do. I hate sticking with the same thing all the time."