Mom-to-be Natalie Portman kept her baby bump under wraps Thursday night at the New York Film Festival premiere of her new film

By Dave Quinn
October 14, 2016 10:05 AM

She’s playing one of the most fashionable first ladies of all time, but Natalie Portman was a vision herself on Thursday, at the New York Film Festival premiere of her new film about the life of Jackie Kennedy.

The 35-year-old Oscar winner, who is pregnant with her second child, wore a chic cocktail-length navy flowing dress with scoop-neck collar to the opening at Lincoln Center’s Alice Tully Hall.

Her hair back, she accessorized the sleek look with a pair of stunning green-beaded earrings and simple pumps.

RELATED VIDEO: Natalie Portman Is Pregnant!

Portman debuted her growing baby bump in a stunning Dior gown in September at the Venice Film Festival premiere for her new film Planetarium.

The baby on the way will be the second child for her and her husband, French choreographer Benjamin Millepied. The couple, who were married in 2012 in Big Sur, California, are already parents to 5-year-old son Aleph.

RELATED VIDEO: Natalie Portman talks about becoming Jackie Kennedy

Jackie, which has been earning rave reviews on the festival circuit, tells the story of the former First Lady in the days after her husband’s 1963 assassination in Dallas.

“People like to believe in fairy tales,” Portman says in the trailer. “Don’t let it be forgot that for one brief shining moment, there was a Camelot. There won’t be another Camelot. Not another Camelot.”

The film also stars Peter Sarsgaard, Billy Crudup, Greta Gerwig, John Hurt and Max Casella as the members of the first lady’s inner circle during this pivotal time.

“[We see] the toughness of who she was, dealing with what she had to go through while keeping herself together for the sake of the country and her family,” Portman previously told PEOPLE. “And also the vulnerability and the intelligence of how she really crafted [JFK’s] legacy.”