The 18-year-old is scheduled to debut at the Bal des Debutantes on November 25, according to the organisation, which confirmed the news to Vanity Fair.
Ava, who is one of the six American debutantes out of a total of 20, will wear a gown by Giambattista Valli Haute Couture.
She will be accompanied by her escort, Maharaja Padmanabh Singh of Jaipur.
Witherspoon and Phillippe's oldest child will follow in the footsteps of previous celebrity children including Robert Kennedy Jr's daughter, Kyra Kennedy, Larry David's daughter, Romy David, Sylvester Stallone's daughter Sophia Rose Stallone as well as Bruce Willis and Demi Moore's daughters Scout and Tallulah Willis.
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