The 'Diamonds' singer specially travelled to Los Angeles on Christmas eve from her native Barbados to be with Brown, and the pair were seen having fun together at a basketball game, reported E! Online.
The pair were spotted cuddling and flirting at the Staples Centre while watching the LA Lakers take on the New York Knicks.
Rihanna was all dressed up, wearing a black midriff-baring outfit, heels, gold choker necklace and red lipstick.
Afterward, Rihanna tweeted a photo of herself and Chris posing in front of her new Porsche 911 Turbo S with the caption, "ThugLife #merryChristmas."
Rihanna also posted what appeared to be an old picture of herself wearing Santa hat and fatigues while with friends.
"Santa baby! Hurry down the chimney tonight! Is it too late to be nice?" she wrote.
She had earlier spent Thanksgiving as well with Brown. The volatile couple reconciled earlier this year even though Chris is still on probation for beating her up in 2009.
