Chris Brown and Rihanna
Chris Brown and Rihanna seen in this file photo when they were a couple Christopher Polk/Getty Images for NARAS

Chris Brown has sent out birthday wishes to Rihanna's mother Monica Braithwaite on 6 April, fueling rumors that the former couple may reunite.

We Found Love hitmaker's mother posted an adorable Instagram photo of herself, marking her 57th birthday. She captioned the picture as, "Thanking God today for 57 years. The best thing about today is being blessed with love from all you guys. You make it so special. Love you," followed by several hugs and kissing emojis.

Brown commented on Monica's post and wrote, "HAPPY BDAY" and a red heart emoji.

Rihanna and Brown went through a breakup in 2009 after he beat her up during Grammy night. However, fans are still hoping that they will get back together. One user commented, "Get back together already." Another fan wrote, "I wish they were back together."

A report in Hollywood Life has alleged that the Barbadian singer appreciated the fact Chris sent birthday wishes to her mother. A source told the gossip website, "Rih appreciates, more than one will ever know," that "Chris sends her mother love." The Diamonds singer allegedly thought Chris comment on Monica's Instagram was "so sweet, sexy even, and unexpected."

The singer apparently found Chris's gesture "genuine" as the source was quoted as saying, "Rih knows Chris is on tour, doing his thing, but him taking time to drop her mother a special note like that on Instagram, that speaks volume to Rihanna," the insider said.

The source revealed that the rapper would always ask about her mother when they were together and treated her mom "like royalty", and added that his message to her "definitely earned him major cool points," the source said.

After their breakup, Rihanna was rumoured to be involved with Drake, while Brown dated Karrueche Tran on and off for several years, before calling it quits in March, 2015.