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New York – from www.nypost.com – Hooker-turned-teacher Melissa Petro yesterday admitted she knew her sex-for-hire past would land her in detention.

“Didn’t you see this coming?” fellow Bronx teacher Ruben Brosbe asked Petro via Facebook after her sordid former sideline was revealed in The Post.

“We talked about it on the first day of training,” Brosbe reminded his pal.

“Of course I saw it coming,” the feisty Petro, a third-year art teacher at PS 70, wrote back.

Brosbe and Petro declined comment yesterday.

But Petro — who has been reassigned amid an Education Department probe of her blogging about her exploits as a “former sex worker” — joked on Facebook about how she hoped a car outside was a teachers-union escort and not “one of the 200 creepy dudes now trying to ‘friend’ me.”

Schools Chancellor Joel Klein yesterday called the scandal “an unfortunate circumstance.”

One PS 70 parent, Carol Martinez, fumed, “I’m not going to have my daughter in the classroom with a prostitute.”