The Daily Mail has an article they got from the Wall Street Journal, however, at WSJ its a subscription article so....
Bomber's ex-GIRLFRIEND revealed: High school sweetheart 'slapped' by Tamerlan calls him a 'bully' and a 'little tough guy'
Bomber's ex-GIRLFRIEND revealed: High school sweetheart 'slapped' by Tamerlan calls him a 'bully' and a 'little tough guy'
Nadine Ascencao, 25, said Tsarnaev 'was a little tough guy' in high school
In 2009, he 'admitted slapping her during an argument about another woman', police records show - but the charges were dropped
Ascencao said she never believed he was capable of anything 'major'
Friends say he had a pattern of verbal abuse and violence towards women
By LYDIA WARREN
... "Despite her claims, Ascencao was once allegedly the victim of Tsarnaev's temper; police records show she was the woman who accused him of slapping her on July 28, 2009, The Journal reported." ...
"She refused to speak to The Journal about the incident, but records show she told police he had slapped her in the face during an argument over another woman - presumably Katherine Russell, whom he met at a club that year and went on to marry in 2010 - at his home in Cambridge.
She was 'crying hysterically' and called 911 to report that she was 'beat up by her boyfriend', Cambridge Police Officer Angela Pereira wrote in the arrest report."
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Just as I suspected all along. This is the Italian Portuguese girlfriend.