Rihanna has written an emotional letter to her fans about Chris Brown.

The 24-year-old superstar was left reeling after her on/off boyfriend Chris was recently pictured partying with scantily-clad girls on tour in Paris and enjoying a meal with his ex-girlfriend Karrueche Tran in Dubai, posting a series of cryptic tweets yesterday (13.12.12) thought to be referring to Chris.

She has now uploaded a photograph to Twitter of a heartfelt letter to her fans, thanking them for their constant support and telling them to stand up for what they believe in and refusing to be defeated by mistakes and ''curve balls''.

The handwritten note contains the lines: ''There's no question that life throws us curve balls, we do our best to deal with them, take the lessons and keep it moving without regrets...

''I look forward to embarking on this ride with you, unwilling to sacrifice what we believe in, taking our lessons and growing from them. Don't let one thing shake your core. Let our inspirations drive us, never steering from who we truly are....''

Over the weekend, a furious Rihanna took to Twitter to vent her feeling about Chris - who was arrested for violently assaulting her in 2009 - in an X-rated rant.

In a series of tweets, she wrote, ''Examine what you tolerate'', ''Goodbye muthaf*****'', ''You give, you get, then you give it the f*** back'' and ''Claps for the basic b****** (sic)''

In between posting raunchy images of herself, she followed it up yesterday, musing: ''Never underestimate a man's ability to make you feel guilty for his mistakes.''