By Yaron Steinbuch and Joshua Rhett Miller

Lauren Pazienza, the 26-year-old woman accused of shoving an elderly former vocal coach to her death, was blasted by her former high school and college classmates Friday, including by one who said “Karma is a bitch” about the accused killer.

“Karma is a bitch,” Trey Siemers, a former classmate posted on a public Facebook post about Pazienza. “She told the deans I called her a firecrotch and I got suspended for it. I didn’t even know what that meant at the time until they told me I said it to her.”

The fiery socialite and scion of a cesspool dynasty has been hit with manslaughter and assault charges in the March 10 death of Barbara Maier Guster, 87, a beloved former Broadway voice coach whom she called a “bitch.”

Her A-list attorney, Arthur Aidala, claimed to the judge that “pushing someone who’s on the sidewalk” isn’t the same as “pushing someone in front of a cliff” or “pushing someone in front of a moving train” — as he accused Manhattan DA Alvin Bragg’s office of “overcharging” his client.

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