JERSEY Shore star Ronnie Ortiz-Magro has been arrested for domestic violence, US reports claim.

The MTV star was handcuffed at 3am this morning and led to a police car while topless after the row, which FOX LA claims was over his baby daughter, 18 months.

4 Ronnie's known for his quick, temper on the show Credit: Getty Images - Getty

TMZ reports that the reality star "went on a drug-fuelled rampage" and threatened girlfriend Jennifer Harley with a knife - and then locked himself in an AirBnB they were renting with their baby daughter Amelia.

The row started when Ronnie "slapped and punched" Jen in the face and she went running out of the house, screaming for help. Neighbours called the police, who arrived to find Ronnie "chasing her with a knife" - reportedly locking himself in the rental property with their daughter Ariana.

According to reports, cops had to break down the door and taser Ronnie, then handcuff him to a gurney.

He's now in hospital and will be charged with kidnapping, according to TMZ.

EXCLUSIVE:

Jersey Shore’s Ronnie Ortiz in handcuffs after 3am domestic violence incident. Woman reported being assaulted + that Ortiz had her baby inside home. Police say he wouldn’t come out so they broke down door to rescue baby. Coming up live on @FOXLA #JustOneStation pic.twitter.com/Iy6xNg2CJr — Gigi Graciette (@GigiGraciette) October 4, 2019

4 Ronnie and daughter Ariana Sky Credit: Instagram

It’s not the first time the Jersey Shore star has had to deal with the police. Cops were called to the Las Vegas home he shares with on-off girlfriend Jen in January.

Ronnie later filed a police report against Jen, claiming she battered him in a 3am fight.

In May this year, Jen, with whom he shares a daughter Ariana Sky, 2, was arrested after another row broke out at 3am and she called cops claiming someone in the home had a gun.

The couple were also thrown out of a strip club on New Year’s Eve 2018 for fighting over a phone – which later resulted in Jen being spoken to by police.

4 Ronnie and on/off girlfriend Jen Credit: Instagram/@jennharley

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4 Ronnie with the show's cast - L to R: Ronnie, The Situation, JWOWW, Deena, show producer SallyAnn Salsano, Vinny, Pauly D and Snooki Credit: Getty - Contributor

Ronnie was also arrested in front of Jersey Shore cameras for fighting outside a New Jersey nightclub and was sentenced to community service for the crime in 2011.

Earlier this year, Ronnie entered rehab to deal with alcohol issues and depression.

Jersey Shore ran from 2009 to 2012, but returned last year for Jersey Shore: Family Vacation, where fans have seen his volatile relationship with girlfriend Jen play out – most recently with a screaming row over co-star JWOWW.

Jersey Shore's Ronnie Ortiz-Magro has blazing row with girlfriend Jen Harley

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