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OSCAR BURGER FOR HUNGRY HIL

Call it the Million Dollar Burger.

Proving she’s truly Hollywood’s anti-diva, “Million Dollar Baby” superstar Hilary Swank celebrated her second Best Actress Oscar in style – at a fast-food joint.

Still dressed in her stunning backless gown, the sexy superstar zoomed off to Astro Burger in West Hollywood last night after partying at the Governors Ball and the Vanity Fair shindig. She ordered a vegetarian cheeseburger and fries.

“She walked in with a big smile, raised the statue over her head and everybody burst into applause,” owner Dino Andrianos told The Post. “It was a thrilling moment for everyone.”

The brown-eyed brunette, accompanied by actor-hubby Chad Lowe and a couple of pals, then grabbed a table and plopped the gold statue down next to her tray.

And while other Oscar winners sipped flutes of Dom Perignon at swank parties, Swank herself was content with a wax cup filled with plain old root beer.

Between bites, she glanced sideways at her second gold statuette – this one for her stunning portrayal of a scrappy female boxer. Her first win was for the gender-bending drama “Boys Don’t Cry” in 2000.

Andrianos said the red-hot actress has been a longtime patron of Astro Burger, whose list of regulars has included Leonardo DiCaprio, Sheryl Crow, Charlie Sheen and the late Marlon Brando.

“She doesn’t have the personality of a star. She’s just a regular person – and very low-key,” Andrianos gushed.

“As far as we’re concerned, she was a Million Dollar Baby even before the movie!”