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  (PHOTOS) REUTERS/Mario Anzuoni
  Rihanna and Chris Brown at the 55th annual Grammy Awards in Los Angeles, California February 10, 2013.

Rihanna had a lot to celebrate on Sunday night; the singer appeared happy with boyfriend Chris Brown during the 2013 Grammy Awards where she performed twice on stage. The singer was also honored with a Grammy for her music video "We Found Love."

Afterwards, Brown was photographed driving what appeared to be a very tired Rihanna home.

"Chris was shot driving away from the club with Rihanna in the passenger seat at around 3:20 AM ... which would be a big issue if he's driving under the influence of pot -- a big issue because he's on probation for beating his passenger to a pulp," TMZ wrote.

Other photographs of Rihanna leaving the event also revealed that the "Disturbia" singer was wearing what appeared to be an engagement ring on her left finger.

Twitter fans quickly reacted.

"Is that a wedding ring on Rihanna?" one Twitter user said.

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Another said, "Rihanna engaged?!?! Or that's some type of promise ring?"

"Hope that's just an accessory," a third fan prompted.

The couple has been rumored to be dating but it was not until last month that Rihanna confirmed the reunion despite public criticism.

"Even if it's a mistake, it's my mistake," she said of her and Brown's relationship during in an interview with Rolling Stone magazine. "After being tormented for so many years, being angry and dark, I'd rather just live my truth and take the backlash. I can handle it."

Four years ago on the eve of the Grammy Awards, the R&B couple split after Brown hit Rihanna during a domestic violence dispute that took place in the car following a party.