A Bronx public school teacher whose social media was peppered with smiling snaps showing her laughing with friends or clutching a bottle of bubbly, was all scowls Saturday as she denied allegations she sexually assaulted a student.

Wearing a red Marist College sweatshirt and an annoyed frown, Dori Myers listened as prosecutors accused her of performing oral sex on a 14-year-old boy, and said a fellow teacher witnessed Myers massaging the victim.

Myers, 29, a social studies teacher at The New School for Leadership and the Arts in Kingsbridge, was busted Friday night and charged with criminal sexual act in the second degree and endangering the welfare of a child.

Prosecutors initially requested a $50,000 bail and said Myers “abused her position as a trusted authority figure,” but Judge Laura Drager eventually released the teacher on her own recognizance.

Cops got word of the incident after the boy, believed to be Myers’ student, told a classmate. The classmate then notified a school administrator, according to police.

The alleged assault took place in Upper Manhattan on Nov. 1, according to a criminal complaint.

Myers who lives in Rockland County where her husband is a sheriff’s deputy, denied the allegations, said lawyer, Andrew Stoll.

Stoll noted the teacher had started a track team at the Bronx school, where she had worked since 2014.

“It just takes one person’s accusation to make an arrest in this town and she’s a model citizen who looks forward to clearing her name,” Stoll told The Post.

The brunette wrote about her students, and partying, on social media, where she posted a since-deleted picture of herself beaming in a dark blue, low cut tank top that read “Champagne All Day, ” while holding a bottle in one hand and a glass of bubbly in the other.

In another now-deleted image, Myers is wearing a white top with the bawdy phrase: “Whiskey Makes Me Frisky.”

Her students weren’t shy about commenting on her looks, Myers wrote in a 2015 tweet.

“Ms. You’re like, real pretty, but, no offense, you got a big forehead,” the now-deleted tweet read.

The judge issued a 30-day order of protection requiring Myers to stay away from the victim.

The Department of Education called the allegations “deeply troubling” and said Myers, who has no prior disciplinary history, was immediately reassigned “away from students.”

Additional reporting by Joe Marino