Lenny Hochstein’s girlfriend claims Lisa created fake Instagram to cyberbully her

Lenny Hochstein’s girlfriend is shutting down Lisa Hochstein’s claims that she would be “detrimental” to his children – while also alleging that the “Real Housewives of Miami” star has been cyberbullying her, despite Lisa firmly denying the accusations.

Katharina Mazepa tells Page Six exclusively that she has never met her plastic-surgeon beau’s kids despite Lisa’s statements in recently filed court documents.

“The kids would not know who I am if I stood next to them,” Mazepa claims.

A rep for Mazepa, 26, also echoed the model’s statement and claimed that the Bravolebrity created a fake Instagram account — a “finsta” — to cyberbully the plastic surgeon’s new girlfriend.

“In May, Lisa called Katharina and threatened her on the phone,” her rep claims. “Lisa has created a fake Instagram page and has continually cyber bullied Katharina.”

In a statement to Page Six Wednesday, Lisa slammed Mazepa’s claims as “childish antics.”

“I’ve got no time for Katharina’s childish antics and accusations,” Lisa says. “They are false and just show her true colors and motives. I have my children to focus on and I am trying to keep them away from her and this negativity. None of these allegations are true.”

In Lisa’s court filing, obtained by Page Six, she alleged the self-proclaimed “boob god” had been exhibiting “volatile behavior” in front of their kids amid their divorce, so she was forced to “flee” the family’s $52 million mansion on Star Island.

In the court papers Lisa filed, which have since been made confidential, she also asked the court to demand Lenny not expose her young kids to his “presumed” girlfriend, which she deems “detrimental to the best interests of minor children.”

Lenny’s lawyer, Richard Preira, then claimed to Page Six that Lisa “seems to crave attention, and so issues allegations that are inflammatory and the opposite of the truth.”

Preira also alleged that when Lenny moved out of the master bedroom, Lisa “stalked him in the house” so he moved out. “Now she stalks him in the media and social media,” he added.

Lenny filed for divorce from Lisa on May 20 after 12 years of marriage, citing “irreconcilable differences” as the cause of the split. Just days earlier, Lenny told Page Six exclusively he was planning to file.

“Lisa and I are getting divorced,” he told us over the phone on May 16. “A few weeks ago, I denied this because I am trying my best to protect my family during this process.”

He added, “This is a very difficult time, and I would ask for some privacy so that we can best take care of our children who mean the world to us.”