American singer Chris Brown reportedly dissed his former girlfriend Rihanna, after his reunion with Karrueche Tran.

According to a report in Hollywood Life, the 25-year-old R&B artist told Tran that she means everything to him.

"Chris told Karrueche, 'Bae, I'm about to man up. You've stole my heart and no woman has ever treated me the way you have. No one, not even any of my exes compare to you. You're my queen.' Chris also apologized to Karrueche, specifically for comparing her to Rihanna and lying about her and Drake dating. He was like, 'I don't know what I was thinking by saying that s***. Rihanna is nothing compared to you. You see I'm with you. I will never, ever compare you to her as long as I live. She doesn't even exist to me. You are my everything. Everything I am and have is because of you'," a source told the website.

Brown infamously assaulted the five-time Grammy winner in 2009, by hitting her so forcefully that she had major bruising on her face, a split lip, and a bloody nose.

The Say Goodbye singer reportedly started dating Tran amidst his romance with Rihanna. The two briefly split in October 2012 when Brown admitted he was "in love with two people".

Brown and Tran had briefly split earlier this month, after the Loyal singer accused her of cheating on him with rapper Drake.

However, the couple reunited and Tran sparked engagement rumours on Christmas Day when the 26-year-old model shared a photo of two diamond rings on Instagram.

Brown, during an appearance on Hot 97's Ebro In The Morning radio show, had expressed his love for Tran.

When asked how long they have been together, he replied: "Almost five years. Four and a half. She's straight I dig her, I dig her man, She's dope.

"I feel like especially being in this industry you need someone that understands you and understands who you are personally except for your name.

"You don't have to be buying them bags, let me stunt on you right quick. Although I do it because I love her, but that don't come with the territory, at the end of the day we have a real connection as best friends on top of our intimacy," he added.