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Child’s play!

A 13-year-old Westchester girl is wowing the judges on “The X Factor” with her “old soul” and has a legion of new fans online.

Singing sensation Carly Rose Sonenclar comes into this week’s “boot camp” episodes of “The X Factor” as the Fox TV show’s early-season standout.

She’s attracted a mind-blowing 7.3 million hits, more than any other “X Factor” contestant, on the show’s YouTube page.

When Carly watches herself online, she still doesn’t believe that’s her on the stage.

“It felt like I was watching the show. It was crazy to think that I was actually there and I was in front of these people and they were focusing on me — that it was real,” she told The Post.

Carly’s middle-school classmates, too, were watching.

“School is definitely a lot different” since “The X Factor,” she said.

“I’m signing autographs in school, taking pictures in school. Not comfortable. It’s a little weird.

“I mean it’s nice, but it’s a little different . . . It’s something you have to adjust to. Sometimes, you just want to be able to go to school and forget about this stuff.”

Carly brought the house down with a beyond-her-years version of Nina Simone’s “Feeling Good,” drawing a mix of wild cheers and disbelieving stares.

No one thought the tiny Mamaroneck teen could have belted out such a complicated melody with such old-soul conviction.

Record producer and “X Factor” judge L.A. Reid said,“Honey, you may be 13, but your soul is old.”

Not even the king of nasty, Simon Cowell, could come up with a harsh word for Carly.

He could only joke, “That’s not you singing. Somebody is behind you, hiding behind the screens singing that song.”

Carly grew up watching “American Idol” and dreamed of going on Fox’s famed talent show.

“My brother [Russell, now 18] would actually pretend to be Simon Cowell, my grandmom would be Paula Abdul, my dad would be Randy Jackson,” Carly said. “So I would sing, and they would, like, judge me.”

When Carly wanted to take her shot at stardom this year, she was two years too young for “Idol.”

“Idol’s” loss is “X Factor’s” gain, as Carly lit up auditions with the standout performance.

Carly’s parents — graphic-designer mom Terri Edelman Sonenclar and copywriter dad Bob Sonenclar — insist that their little girl won’t head down any Lindsay Lohan- or Amanda Bynes-esque path of teen stars gone bad.

As far as they’re concerned, Carly is just another schoolgirl who enjoys softball and cooking.

“The way that I’ve always described her is that this doesn’t define her,” Bob Sonenclar said. “Entertainment is not who she is — it’s what she does.”

“The X Factor” airs Wednesdays and Thursdays on Channel 5 in the city. This week’s shows mark the “boot camp” portion of the series, with singers going through rigorous training.

Additional reporting by David K. Li