The same day the one-time couple reportedly hooked up, Chris tweeted, "Happiness is the one thing I'm never guaranteed..... How can U expect me to guarantee yours?"
This isn't the first time in the years since Chris was charged with a violent assault on Rihanna in 2009 that the two have secretly hooked up.
"Those two have a thing for each other that will never die, no matter what, and they're on their way to really being back together. Chris just adores her. And she tended to him, making sure the gash on his chin from the fight was okay."
And then in September at the 2012 MTV Video Music Awards, Rihanna was caught on camera giving Chris a kiss while the two exchanged pleasantries in the audience.
Chris received five years of probation, community labor and one year of domestic-violence counseling in connection with his beating of the Umbrella singer.