Actress Gabrielle Union will host the fourth annual BET Honors for the third time in a row this Saturday at the Warner Theatre. The star-studded event will celebrate lifetime contributions and service to black culture and will honor actress Cicely Tyson, actor and singer Jamie Foxx, supermodel Iman, publisher Linda Johnson Rice, composer Herbie Hancock and historian Lonnie G. Bunch. Trey Songz, Ne-yo and Keyshia Cole are also expected to perform. Proceeds from this year's event will benefit the Washington, D.C. Martin Luther King, Jr. National Memorial Project Foundation. The special will air during Black History Month, Feb. 21 at 9 p.m.