Walk The Line's Reese Witherspoon was among the nominees who attended the pre-Oscars lunch at the Beverly Hills Hilton hotel on Monday.
Brokeback Mountain's best actor nominee Heath Ledger arrived with co-star, fiancée, and best supporting actress nominee Michelle Williams.
Best supporting actor nominee Matt Dillon said his role as a bigoted policeman in Crash had breathed new life into his career.
Terrence Howard, nominated for best actor for his work in Hustle and Flow, was also at the lunch, which is designed so the nominees can all meet before the 5 March ceremony.
Keira Knightley said her Pirates of the Caribbean co-stars, including Johnny Depp, were making fun of her for winning an Oscar nomination.
Actor William Hurt - whose supporting role in A History of Violence has earned him a fourth nomination - revealed that his first Oscar has been stolen.
Walk The Line's Joaquin Phoenix rubbed shoulders with other actors, costume designers, directors, sound mixers and screenwriters at the event.
Charlize Theron said she was stunned at winning her second Oscar nomination in as many years, for North Country, saying the honour was "insanely flattering".
Best actress nominee Felicity Huffman, of TransAmerica, said she was so excited that she arrived at the luncheon hours early.
116 Academy Award nominees gathered for the traditional pre-Oscar ceremony luncheon. Another four nominees were stranded by the snow in New York.