Portman wins best-actress Oscar for `Black Swan`

Los Angeles: Natalie Portman has won the best-actress Academy Award for her role as a delusional ballerina in "Black Swan," while Tom Hooper has claimed the best-director Oscar for his British monarchy saga `The King`s Speech`. Christian Bale and Melissa Leo earned supporting-acting honors Sunday for the boxing tale "The Fighter." Portman won over a field that included Annette Bening, who has lost on all four of her Oscar nominations. "The King`s Speech" was expected to claim the last two awards, best actor for Colin Firth and best picture. It also won original screenplay for David Seidler, a boyhood stutterer who was inspired by his story`s subject, stammering King George VI as he struggles to vanquish his crippling speech problem.