Pregnant teen star Jamie Lynn Spears was injured trying to break up a brawl while daddy-to-be Casey Aldridge was knocking back brewskis with his buds, Enquirer reports!

Pregnant Jamie Lynn Spears injured in fight as drunk Casey Aldridge looks on?

An estimated 500 teens showed up at a barn party April 5 at the home of Casey’s pal.

Despite security guards for crowd control, the police were summoned to investigate a possible sexual assault on a girl.

Jamie Lynn, who had just turned 17 the day before had been reluctant to attend but had agreed to be 18 year old Casey’s designated driver.

Just past midnight two of Casey’s pals started fighting for the same girl.

“Jamie Lynn decided she could break it up but got elbowed in the mouth by one of the boys,” said an insider. “She went crazy, screaming at everyone!”

“Jamey Lynn kept asking Casey, ‘What if I would’ve gone into labor, what help would you be?’” the insider revealed.