Singer-songwriter-producer Pharrell Williams is to perform his Oscar-nominated song "Happy" at the Academy Awards ceremony in Los Angeles. Telecast producers Craig Zadan and Neil Meron announced they booked Williams Tuesday. Williams, a seven-time Grammy Award winner, wrote and produced "Happy" for the animated movie "Despicable Me 2." It is nominated for Best Original Song. The three other nominated songs are "Ordinary Love" from "Mandela: Long Walk to Freedom," "Let It Go" from "Frozen" and "The Moon Song" from "Her." The Oscars, with Ellen DeGeneres serving as host, will air March 2 on ABC.