Racing driver Davey Hamilton Jr. was arrested on charges of false imprisonment and aggravated assault on Saturday

Race car driver Davey Hamilton Jr. is facing charges of aggravated assault and false imprisonment after allegedly holding his ex-girlfriend at knifepoint in a hotel room.

Hamilton Jr, who is the son of former IndyCar driver and Indianapolis 500 competitor Davey Hamilton, was arrested on Saturday in West Palm Beach Florida.

The 21-year-old is accused of breaking into his ex-girlfriend's hotel room with a knife after luring her to the state by posing as the owner of a vodka company, who was interviewing her for a brand ambassador role.

Hamilton Jr allegedly enlisted a chauffeur to bring the young woman to the hotel and paid for the room. When she arrived, he reportedly sent her a text saying 'get ready', prompting her to get in the shower.

According a West Palm Beach Police Department probable cause affidavit seen by USA today, Hamilton Jr then crept into the room and ripped down the shower curtain while holding a 10-inch knife.

He then forced the alleged victim to sit on the bed before interrogating her and accusing her of cheating on him, the affidavit says.

The Idaho native, whose father is racing driver Davey Hamilton, has had his bail set at $30,000

Hamilton Jr reportedly admitting to wanting to 'scare' his ex-girlfriend after allegedly interrogating her in a hotel room while holding a 10-inch knife

Hamilton Jr reportedly also told the woman 'it didn't have to be this way', before she was able to escape the room and track down someone to help her.

After initially chasing the woman, the USAC Silver Crown series and former Indy Lights driver fled the hotel.

He was later taken into custody and confessed to intending to 'scare' his ex-girlfriend but said he did not want to physically harm her, according to the affidavit. The report also says he admitted purchasing a knife, duct tape and restraints.

According to a probable cause affidavit, Hamilton Jr. lured his former girlfriend to the state by pretending to be the owner of a vodka company who was interviewing her for a brand ambassadorship

The Idaho native's bail has been set at $30,000 following charges of two third-degree felonies - assault with a deadly weapon without intent to kill and armed false imprisonment.

Hamilton Jr's attorney Jim Voyles told IndyStar: 'We believe that the facts ultimately may come out a little differently than they are being portrayed at this time.'

'We believe there is another side to this story,' he added.