Rihanna broke down in tears while discussing her ex Chris Brown during an interview with Oprah Winfrey.
The We Found Love singer apparently wept as she recalled the 2009 attack which resulted in Chris being sentenced to five years' probation and community service.
In the US TV interview, to air this Sunday, Rihanna reportedly revealed she felt "angry, hurt and betrayed" after the R&B star assaulted her before the Grammy Awards in LA.
"It was embarrassing, it was humiliating. I lost my best friend," The Sun quotes Rihanna as saying.
"As angry as I was, I just felt like he made that mistake because he needed help. And who's going to help him?
"Everybody's going to say he's a monster, without looking at the source. And I was more concerned about him."
Earlier this year, Rihanna caused controversy when she collaborated with Chris. She was also rumoured to have had a rendezvous with the singer on a yacht in the South of France last month.
Rihanna With Jay Z In 2005
Rihanna On MTV's Total Request Live-show, 2005
Rihanna Performs On NBC News' Today Show, 2011
On Stage At V Festival In Chelmsford, 2011
At The Rock In Rio Music Festival, Brazil, 2011
Filming Her New Video In Belfast, 2011
The Look That Upset An Irish Farmer, 2011
On Her Loud Tour At The 02 Arena London, 2011