VIDEO : Madonna, Stevie Wonder Remember Prince

Stevie Wonder and Madonna paid homage to Prince during Sunday's Billboard Music Awards in Las Vegas. Madonna wore Prince's signature color -- purple -- and sat on a purple velvet throne as she sang Nothing Compares 2 U. The song was written by Prince and recorded by Sinead O'Connor. Stevie Wonder then joined Madonna for Purple Rain, with the audience singing along. Prince died in April at age 57.