The Academy is making changes aimed at combatting the dearth of diversity in its nominees.
The actor said his late co-star "refused" to participate in an opening monologue that poked fun at the film's gay love story.
It was highly anticipated that she would have been nominated for an Academy Award for her role in Hustlers.
The US President took aim at the South Korean movie at a rally in Colorado.
Natalie Portman Speaks Out After Rose McGowan Labels Her A ‘Fraud’ Over ‘Deeply Offensive’ Oscars Cape
The Black Swan star wore a cape to Sunday's Oscars embroidered with the names of female filmmakers ignored by the Academy.
The awards show organisers have explained why many big-name stars were left out of this year's tributes section.
The two actors, who quietly dated from 2009 to 2011, bumped into each other at the ceremony.
The star was a guest of Jonathan Van Ness and was living her best life as she rubbed shoulders with A-listers.
The Black Swan star made headlines when she arrived in a cape adorned with the names of the year's top female directors.
New music is expected from the singer this year.