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20 February 2012, 08:09
The 'Turn Up The Music' singer and 'Talk That Talk' star have exchanged messages on the social networking site.
Chris Brown has posted a message to Rihanna wishing her a happy 24th birthday.
The 'Beautiful People' singer send the 'We Found Love' star the congratulatory message this morning (20th February), following which Rihanna quickly thanked him for the birthday wishes.
"HAPPY BIRTHDAY ROBYN!" Chris tweeted earlier today.
Rihanna then retweeted Chris Brown's celebratory message along with a simple, "Thanks!"
The two artists are rumoured to have worked together recently on a remix to Rihanna's 'Talk That Talk' album track 'Birthday Cake', although no official announcement has been made.
The track's producers Da Internz teased last week that Rihanna's 'Birthday Cake' remix would feature a collaboration that will "shock the world".
The 'You Da One' also revealed earlier today that she will be working on some new music during her stay in London.
Rihanna is currently in London preparing for her performance at the BRIT Awards 2012 tomorrow (21st February).