Natalie Portman has agreed to play the lead in Darren Aronofsky’s “Black Swan,” a development that could help the stalled project take flight.

“Swan” — a supernatural thriller set in the world of New York City ballet — was set up in early 2007 at Universal, but the studio eventually dropped the project. It has been making the rounds of studios and specialty divisions.

“Swan” centers on a veteran ballerina who finds herself locked in a competitive situation with a rival dancer, with the stakes and twists increasing as the dancers approach a big performance. But it’s unclear whether the rival is a supernatural apparition or if the protagonist is deluded.

Those who have read the script say it’s a spine-tingler with elements of “The Others.”

Aronofsky, whose acclaimed Mickey Rourke-starring drama “The Wrestler” has put him in high demand, has been developing the “Robocop” reboot at MGM