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YouTube star Jake Paul threw a massive rager at his Los Angeles mansion — and authorities are now investigating reports that partygoers had their drinks spiked.

The Los Angeles County Sheriff’s Department said at least one person filed a complaint after the 22-year-old threw a bash at his Calabasas home Saturday night for the rapper Desiigner.

“We had a person who came forward,” Lt. Jennifer Seetoo told The Post on Monday. “She indicated she was drugged at this party on Saturday.”

The drugging allegation came as a concerned mom took to a private Facebook group Sunday night, claiming her underage daughter and a group of pals had something slipped in their drinks.

“My daughter was at a party in Calabasas last night for YouTube Jake Paul. The house was a mansion filled with young people,” she wrote on the “Moms of Conejo Valley” page. “She ended up in the hospital with eight other girls who had been drugged and ended up at West Hills Hospital incoherent.”

In the post, the mom claims the girls were “half naked and unable to walk or talk.”

The sheriff’s office said they’re aware of the Facebook post and have reached out to investigate further.

“We called hospitals,” Seetoo said. “So far, we have not received information from local hospitals that young adults were drugged.”

In a since-deleted Instagram post, the Los Angeles County Fire Department said they “spent the majority of Saturday night transporting multiple patients from a party thrown by YouTuber @jakepaul,” the Daily Mail reported.

Firefighters responded to the former Disney Channel star’s home early Sunday night to transport at least two “sick” people to the hospital, according to BuzzFeed News.

A rep for Paul didn’t immediately respond to a request for comment.