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"Big Brother" alum Christmas Abbott was arrested in Florida this week ... TMZ has confirmed.

Abbott turned herself into authorities Tuesday in Tampa, where she was booked for felony criminal mischief.

﻿According to a police report, obtained by TMZ, Christmas drove to a Tampa gym back in August to confront her baby daddy's alleged side chick. Cops say that Abbott flew into a rage, asking all kinds of questions, and hurling a cup of coffee. She then rammed into the chick's car in the parking lot.

Per the report ... Abbott called the other woman a "pathetic home-wrecking little slut" among other insults.

The responding officer says Abbott continued to scream at the side chick while he tried calming her down. Abbott was 8 months pregnant at the time and, according to the report, cops declined to process her because she was so far along. Her vehicle was seized, but they allowed her to turn herself in later.

For the record, she had a little boy in October.

Abbott came in third place during season 19 of "Big Brother" ... back in 2017. In addition to her stint on 'BB,' Christmas was a big-time CrossFit competitor, and was the first female NASCAR pit crew member.