Aaron Carter’s Ex Named in Domestic Violence Police Report

Aaron Carter‘s ex-girlfriend is now on the radar of cops after she was named a suspect in a domestic violence report.

Law enforcement sources tell TMZ … cops took a report for an alleged incident between Aaron and his ex, Lina Valentina, that went down on July 31 around 2 AM at Aaron’s Lancaster crib. The incident happened just days before Aaron confirmed his breakup with Lina.

Sources close to Aaron tell us when cops paid him a visit earlier this week for a welfare check, they asked him if he’d been having any problems with his ex. Our Aaron sources say he told them she slapped him in the face … leaving him with a bruise the next day.

We’re told the singer showed cops a photo of his injury and they made a report.

As for what triggered the alleged attack … we’re told Aaron told cops he and Lina got into a heated argument. He claims he wanted to be left alone because she wouldn’t stop accusing him of being in love with another girl.

As we first reported … a family member called 911 saying they were worried Aaron was going to take his own life or hurt someone else. They also feared he was doing drugs and could overdose — which is weird, seeing how spirited he got this weekend with fans.