“Real Housewives” star Kim Zolciak’s teen son was arrested this week after allegedly assaulting a female classmate in a gym changing room, according to court documents obtained by Page Six.

Alpharetta police arrested Kroy Biermann Jr, known as “KJ,” on Monday and charged him with aggravated sodomy and aggravated sexual battery for the April incident.

The alleged victim said she was walking with the 15-year-old football player when he began flirting with her and making jokes, according to Fulton County Georgia Juvenille court papers.

He allegedly led her into the changing room of a family locker room area and began to kiss and grope her, the docs say.

The girl repeatedly told him “no” as he was touching her, and accused him of forcing oral sex and digitally penetrating her, the documents claim.

“She finally managed to get away from him, and he pulled up his pants and left,” according to the docs.

Biermann Jr is being held without bond, and he has a hearing scheduled for Sept. 1.

This is a developing story. Please check back for updates.