Amber Portwood, who gained fame in MTV's reality show "Teen Mom," slapped a shoe across her boyfriend's neck while he held their 1-year-old son, according to court documents.

Portwood, 29, was arrested Friday on a preliminary charge of felony domestic battery in the incident that occurred shortly after 2 a.m. Friday at a home in the 8900 block of Anchorage Drive.

According to a preliminary probable cause affidavit filed in Marion Superior Court, Portwood's boyfriend sent a frantic 2:14 a.m. text message to an officer for Geist Patrol.

"I need help," he said in the message. "My life and my son's life is in danger."

IndyStar is not naming Portwood's boyfriend because he is an alleged victim of domestic abuse.

The man later told Indianapolis Metropolitan Police Department Officer Ryan Salisbury that the couple started arguing about 2 a.m.

"Ms. Portwood grew increasingly agitated until she struck him with her shoe in the right side of his neck," Salisbury wrote in the court document.

The man was holding their son in his right arm at the time. The child was not injured.

The officer observed scratches and red marks on the man's neck. An evidence technician took photographs of the injuries.

The man told officers that Portwood has hit him several times in the past and has threatened him countless times.

Portwood told police she was angry that her boyfriend had recorded her yelling.

"Ms. Portwood stated that she did indeed strike (her boyfriend) with a shoe," Salisbury wrote, "but stated that 'it was in the shoulder and I barely hit him.'"

Portwood, who has appeared on reality shows "Teen Mom," and "16 & Pregnant," is scheduled to appear Wednesday in Marion Superior Court.

In November 2010, Portwood faced felony domestic violence charges in Anderson after she was shown on "Teen Mom" attacking her former fiance in August 2009. The couple's then-1-year-old child was present at the time of the incident.

Portwood was officially charged in the incident in December 2010, according to online court records. She pleaded guilty to two felony charges of domestic battery .

Domestic abuse:Amber Portwood of 'Teen Mom' arrested in Indianapolis

Call IndyStar reporter Vic Ryckaert at 317-444-2701. Follow him on Twitter: @VicRyc.