Among the 160-plus nominees who attended Monday's event were Jessica Chastain, Jennifer Lawrence, Quvenzhane Wallis, Naomi Watts, Bradley Cooper, Daniel Day-Lewis, Hugh Jackman, Joaquin Phoenix and Denzel Washington.
Oscars for outstanding film achievements of 2012 will be presented Feb. 24 at the Dolby Theatre at Hollywood & Highland Center in Los Angeles.
Seth MacFarlane is to serve as host of the ceremony.
Exploding whale video goes viral on Internet
Jordana Brewster on Paul Walker: 'He was an enormous presence in my life'