8:29 AM PT -- Indianapolis Metropolitan Police Department tells TMZ, Amber's boyfriend, Andrew Glennon, claimed she assaulted him while he was holding their 1-year-old son. The incident occurred at around 3:00 AM Friday after the couple got in a heated argument.
According to dispatch audio, Amber's boyfriend claimed his and his child's lives were in danger. Police say they have contacted Child Protective Services.
'Teen Mom' star Amber Portwood has been arrested for domestic battery ... TMZ has learned.
She was arrested in Indianapolis Friday just before 6:00 AM. Cops are not saying who the alleged victim is ... per protocol.
Portwood was still in custody at the time of this post.
The 29-year-old and boyfriend Andrew Glennon just had a pregnancy scare on the "Teen Mom OG" show. She also hinted they might soon get married.
She has 2 kids -- 1-year-old James, whose father is Andrew, and 10-year-old Leah, whose father is her ex-boyfriend Gary Shirley.
Portwood went to prison for 17 months back in 2012 for violation her probation in a drug possession case. She actually had a choice of prison vs. rehab ... she chose prison.