Streisand last performed at the Oscars in 1977, when she sang the love theme for "A Star is Born."
"In an evening that celebrates the artistry of movies and music, how could the telecast be complete without Barbra Streisand?" producers Craig Zadan and Neil Meron said in a statement. "We are honored that she has agreed to do a very special performance on this year's Oscars, her first time singing on the show in 36 years."
Streisand hasn't performed at the Oscars, but she has been a part of the ceremony since 1977. At the 75th annual Academy Awards, she presented Eminem with an Oscar for Best Original Song for "Lose Yourself"; at the 82nd annual Academy Awards, Streisand announced that Kathryn Bigelow won for Best Director.
Streisand herself has two Oscars: She won Best Actress at the 1969 ceremony for "Funny Girl" and shared the Best Original Song trophy with Paul Williams for "Evergreen (Love Theme from A Star Is Born)" from "A Star is Born" at the 1977 show.