The 'Fine China' singer wrote a letter to his pop star ex-girlfriend - whom he was convicted of assaulting in 2009, but later reconciled with at various points between 2012 and 2013 - apologising for the way he has treated her, but she was less than impressed and set fire to it.
A source told Hollywoodlife.com: "She put Chris to bed last year for good. As [she and her friends] smoked, Rihanna pulled out this fake ass letter. She put it in the middle of the bed on top of a big candle holder, and put her burnt ashes on it. They all started to put ashes on that letter until it burned.
"Rihanna said, 'Good riddance,' and continued to entertain her guests."
Chris is currently in rehab for anger management in California and was comforted over Christmas by his new girlfriend, Karrueche Tran.
Meanwhile, Rihanna - who has been romantically linked to Drake, Matt Kemp and A$AP Rocky since initially dating Chris - is looking forward to a drama free year with no hassle from men.
A source said: "She wants to have a happy, stress-free year, and she's done with bull***t from men in her life.
"She's gone through some [stuff] last year, and the year before, and she's over games."