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A 20-year-old California woman says pop star Justin Bieber is the father of her baby boy, according to a new report.

The woman, Mariah Yeater, claims that she and Bieber, 17, had sex backstage at one of his concerts when she was 19, according to Star magazine.

BIEBER LEGAL TEAM DISMISSES REPORT AS ‘FALSE’

Yeater wants Bieber to take a paternity test, according to court papers obtained by .the magazine. She also wants him to “provide adequate support for my baby,” the papers say.

Bieber’s reps told Star that the allegation is false.

A court hearing is set for later this year, Star reported.

Bieber dates 19-year-old Selena Gomez. The two recently even adopted a puppy together.

His Christmas album, “Under the Mistletoe,” dropped today and was quickly rising in the iTunes charts.

Bieber has described the release, featuring duets with Boyz II Men and Mariah Carey, as “my best album to date.”