Hudson in vogue as fashion writer in ‘Nine’

For Kate Hudson, working on “Nine” brought back a lot of childhood memories.

She plays Stephanie, an American Vogue fashion writer obsessed with Italian director Guido Contini (Daniel Day-Lewis).

The movie is set in Rome in the 1960s, and the clothes were designed by two-time Oscar winner Colleen Atwood.

Hudson, 30, flashed back to her childhood watching “Bob Mackie make my mother (Goldie Hawn) these phenomenal costumes. I mean dresses, gowns, couture beads everywhere. As a little girl, your eyes are sparkling like Wow! Amazing! Amazing to look at.”

Her “Nine” costumes were “like a throwback to me being a little girl. With these beads that were the real deal. I remember putting on the Swarovski crystal number and it weighed like 15 pounds. And I thought to myself, ‘This is awesome. This is what costuming is about.’ ”

This fan of musical theater and musicals “was obsessed with them as a kid,” she explained at Manhattan’s Waldorf Astoria Hotel.

And Hudson’s also a fan of Rob Marshall, the “Nine” director who made “Chicago” a Best Picture Oscar winner.

“There’s very few people who can put a musical on film and make it seamless. Very few. When you’re seeing a number live you get that energy and then when you put it on screen, you’re missing a dimension and it’s very difficult to bring it to life. Rob has this incredible ability to take that so you can feel it in a movie theater,” said Hudson.

So for Hudson, “Nine” “was basically: I just would like to go sing for Rob Marshall. That was the first thing, ‘Please get me in the room so I can just hit one note and see if he bites.’ ”

Marshall did, and Hudson’s number “Cinema Italiano,” a new song written for the film, salutes ’60s dance styles while showing younger moviegoers what made Italian cinema so electric.