Lawrence and Chastain have both been nominated in the Best Actress category, while Affleck's film Argo has been nominated for Best Picture - but even if they go home empty handed they will still get to walk to stage to hand over somebody else's Oscar.
Other presenters at this year's Oscars will include the cast of The Avengers, Meryl Streep, Octavia Spencer, Jean Dujardin and Christopher Plummer.
Attendees will get to enjoy turns from Adele, who will be performing Skyfall (for which she is nominated for Best Original Song) and from Barbra Streisand - who will be making her first musical appearance at the Oscars since 1977.
In other J-Law news, it has been revealed that she will be reuniting with her Silver Linings Playbook co-star Bradley Cooper and director David O Russell in a forthcoming movie.
According to Deadline, the project was named "American Bulls**t", but is currently untitled.
Cooper is up for Best Actor and Jen has been nominated for Best Actress for their roles in Silver Linings Playbook.
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