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Singer Beyonce attends HBO's New York premiere of her documentary "Beyonce - Life is But a Dream" in New York February 12, 2013. REUTERS/Andrew Kelly

NEW YORK, NY - FEBRUARY 12: Beyonce and Oprah Winfrey speak onstage at the HBO Documentary Film "Beyonce: Life Is But A Dream" New York Premiere at the Ziegfeld Theater on February 12, 2013 in New York City. (Photo by Larry Busacca/Getty Images for Parkwood Entertainment)

Singer Beyonce Knowles attends the premiere of "Beyonce: Life Is But A Dream" at the Ziegfeld Theatre on Tuesday, Feb. 12, 2013 in New York. (Photo by Evan Agostini/Invision/AP)

NEW YORK, NY - FEBRUARY 12: Solange Knowles attends "Beyonce: Life Is But A Dream" New York Premiere at Ziegfeld Theater on February 12, 2013 in New York City. (Photo by Dave Kotinsky/Getty Images)

Oprah Winfrey attends the premiere of "Beyonce: Life Is But A Dream" at the Ziegfeld Theatre on Tuesday, Feb. 12, 2013 in New York. (Photo by Evan Agostini/Invision/AP)

Director Ed Burke attends the premiere of "Beyonce: Life Is But A Dream" at the Ziegfeld Theatre on Tuesday, Feb. 12, 2013 in New York. (Photo by Evan Agostini/Invision/AP)

Models Tyson Beckford and Shanina Shaik attend the premiere of "Beyonce: Life Is But A Dream" at the Ziegfeld Theatre on Tuesday, Feb. 12, 2013 in New York. (Photo by Evan Agostini/Invision/AP)

This image released by Starpix shows Beyonce at the premiere of her HBO documentary " Beyonce: Life is But a Dream," at the The Ziegfeld Theatre in New York. The film premieres on Saturday, Feb. 16, at 9 p.m. EST on HBO. (AP Photo/Starpix, Dave Allocca)

Actress Selita Ebanks attend the premiere of "Beyonce: Life Is But A Dream" at the Ziegfeld Theatre on Tuesday, Feb. 12, 2013 in New York. (Photo by Evan Agostini/Invision/AP)

NEW YORK, NY - FEBRUARY 12: Solange Knowles attends "Beyonce: Life Is But A Dream" New York Premiere at Ziegfeld Theater on February 12, 2013 in New York City. (Photo by Dave Kotinsky/Getty Images)

Actress Angela Bassett attends the premiere of "Beyonce: Life Is But A Dream" at the Ziegfeld Theatre on Tuesday, Feb. 12, 2013 in New York. (Photo by Evan Agostini/Invision/AP)

Singer Beyonce attends HBO's New York premiere of her documentary "Beyonce - Life is But a Dream" in New York February 12, 2013. REUTERS/Andrew Kelly

Singer Solange Knowles attend the premiere of "Beyonce: Life Is But A Dream" at the Ziegfeld Theatre on Tuesday, Feb. 12, 2013 in New York. (Photo by Evan Agostini/Invision/AP)

Model Doutzen Kroes attends the premiere of "Beyonce: Life Is But A Dream" at the Ziegfeld Theatre on Tuesday, Feb. 12, 2013 in New York. (Photo by Evan Agostini/Invision/AP)

Oprah Winfrey attends the premiere of "Beyonce: Life Is But A Dream" at the Ziegfeld Theatre on Tuesday, Feb. 12, 2013 in New York. (Photo by Evan Agostini/Invision/AP)

Oprah Winfrey attends the premiere of "Beyonce: Life Is But A Dream" at the Ziegfeld Theatre on Tuesday, Feb. 12, 2013 in New York. (Photo by Evan Agostini/Invision/AP)

NEW YORK, NY - FEBRUARY 12: Beyonce and Jay-Z attend the HBO Documentary Film "Beyonce: Life Is But A Dream" New York Premiere at the Ziegfeld Theater on February 12, 2013 in New York City. (Photo by Larry Busacca/Getty Images for Parkwood Entertainment)