Otto Preminger chose her to play Joan of Arc out of nearly 18,000 hopefuls.
Gave birth to her daughter Nina Navarra (whose father is Carlos Navarra) on August 23, 1970. Nina died as a result of complications sustained from Jean overdosing on sleeping pills during her pregnancy, on 25 August 1970, two days after her birth.
After Faye Dunaway and Julie Andrews both turned it down, Kim Novak actively pursued the role that went to Seberg in Paint Your Wagon (1969). Actresses considered for Seberg's role in Lilith (1964) included Yvette Mimieux, Natalie Wood, Samantha Eggar, Sarah Miles and Diane Cilento.
Gave birth to her son Alexandre Diego Gary on July 17, 1962.
Her involvement with the Black Panther movement yielded the attention of the FBI, that spread the rumor about her pregnancy in 1970 being a child by Raymond Hewt, a Black Panther movement leader. Although Seberg initially claimed that Romain Gary was the father, she confessed that a Revolutionary student named Carlos Navarra was the father of her child. The incident may have contributed to her persistent depression over the years, and her decision to take her life in 1979.