The Oscars, hosted by Neil Patrick Harris, will take place on February 22.
Howard was nominated for his leading role in 2006's 'Hustle & Flow.' His other films include Oscar-winning Best Picture 'Crash', 'Ray', 'Iron Man', 'Prisoners' and 'Lee Daniel's The Butler'.
Jones is nominated for Actress in a Leading Role for 'The Theory of Everything.'
Her previous film credits include 'The Tempest', 'Like Crazy', 'The Invisible Woman' and 'The Amazing Spider-Man 2'.