Matthew McConaughey won the Oscar for the best actor for his role in Dallas Buyers Club.
Glenn Freemantle accepts the Oscar for sound editing for Gravity.
Darlene Love sings as Morgan Neville - winner of best documentary feature (20 Feet from Stardom) at Oscar.
Neil Corbould, Tim Webber, David Shirk, and Chris Lawrence accept the award for best visual effects for Gravity.
Malcolm Clarke and Nicholas Reed, best documentary short subject winners for The Lady in Number 6: Music Saved My Life.
Kim Magnusson and Anders Walter accept the Oscar for best live action short film for Helium.
Peter Del Vecho, Jennifer Lee and Chris Buck accept the Oscar for best animated feature film for Frozen.
Lupita Nyong'o won the Oscar for best supporting actress for her role as the hardworking slave Patsey in drama 12 Years a Slave, capping a breakout awards season for the Yale-trained Kenyan actress.
Jared Leto became the first winner of the 86th Academy award by taking home the Oscar in the best supporting actor category for his role of a HIV affected transgender in Jean-Marc Vallee"s Dallas Buyers Club.
Nyong'o, 31, won the Oscar in her first feature film role, earning a thunderous standing ovation from the Hollywood audience. She beat fellow frontrunner Jennifer Lawrence's portrayal of a loopy housewife in caper American Hustle in one of the most closely-watched Academy Award races this year.
"Yes!" the actress exclaimed when accepting the award after hugging her brother, 12 Years a Slave director Steve McQueen and other actors in the film. "It doesn't escape me for one moment that so much joy in my life is thanks to so much pain in someone else's, and so I want to salute the spirit of Patsey, for her guidance," she said.
Nyong'o, who earned the same award from her peers at the Screen Actors Guild Awards in January, was chosen for the role from some 1,000 young actresses who auditioned.
She received plaudits from critics for her depiction of suffering as a field-working slave and the object of sexual desire from her master. The award marks Nyong'o's coronation into the top echelon of dramatic actresses working in Hollywood. She has also burnished her image as a new emblem of high fashion with her styles on the red carpet.
12 Years a Slave, by British director McQueen, is based on the memoir of Solomon Northup, a 19th century free black man tricked and sold into slavery. Nyong'o's Patsey, who is able to pick more pounds (kilos) of cotton per day than the stronger male slaves, embodies resilience in the drama even as the primary recipient of physical and sexual violence.
"There was an underlying stream of grief at all times even in the lighter scenes," Nyong'o said last year while promoting the film. "There is a deep pain in Patsey throughout and living in that pain was not easy."