ENTERTAINMENT NEWS (CNN) -- Rihanna may have been too under the weather for a rehearsal, but she did make sure to send her ex some birthday love.
The singer was the musical guest on the latest "Saturday Night Live," and her rep confirmed to CNN that she didn't appear for a rehearsal because she was "was sick, so she needed to save her voice for the live show."
But Idolator reports that she made sure to tweet Chris Brown a Cinco de Mayo birthday greeting before she took to the "SNL" stage.
"Happy birthday @chrisbrown," the tweet said.
Such communication is sure to whip up further speculation about what is going on with the pair, who are forever linked after Brown pleaded guilty in June 2009 to assaulting his then-girlfriend on the eve of the 51st Grammy Awards.
The former couple recently collaborated on Rihanna's single "Birthday Cake," a snippet of which she performed solo on "SNL."