Nelson Mandela's star-studded 91st birthday celebration just got a little more famous. French First Lady Carla Bruni will perform two duets with Dave Stewart, formerly of Eurythmics, at a high-wattage concert at Radio City Music Hall in honor of Mandela, The Times of London reports. The two will sing Bruni's composition "Quelqu'un m'a dit" (Someone told me) and Bob Dylan's "Blowin' in the Wind." Bruni is breaking her pledge not to perform until her husband leaves office because the concert will help fight AIDS, which killed her brother. The concert is the centerpiece of the worldwide celebration of Mandela, which organizers hope will turn into an annual Mandela Day. Stevie Wonder, Alicia Keys, Aretha Franklin, Queen Latifah, will.i.am, Wyclef Jean, and Cyndi Lauper will also perform. Unfortunately, Mandela is too frail to travel and will spend his birthday with friends and family at home.