Speculations as to whether singers Rihanna and Chris Brown are back together keep mounting and a series of posts on the singer's Twitter account last month, is adding to those rumors.

Though Rihanna didn't directly tweet to Brown on Twitter, the posts do spark questions as to whether the Bajan hottie is secretly communicating with her ex who abused her back in 2009.

The series of posts were written on March 31, when she wrote If u don't want me, someone else will ... if I'm not good enough!

Later she wrote, Cry me a river....I already cried.

Another tweet followed, which read, I'm makin' u wait....I need to know if ya worthy.

She later tweeted a line from Beyonce's hit song Freakum Dress, which stated, He's been actin' uuup....but he won't be the only one.

Rumors of a Rihanna-Chris Brown reunion surfaced after the two released songs featuring the other earlier this year.

Rihanna didn't say whether the two were back together romantically.  However, she did tell radio host Ryan Seacreast that there shouldn't be a divide and that the two were just creating music and that it's innocent. Rihanna also said that she was the one who reached out to Brown for collaboration on her song Birthday Cake.

Why She Is In Contact With Brown

Us Weekly has reported that multiple sources have confirmed that Rihanna and Brown, 22, have been hooking up for more than a year.

When the two songs were released earlier this year, they sparked mixed reactions from fans and critics.

Rihanna, 24, told Elle that she respects what others have to say, but that everyone thinks differently.

Rihanna reportedly told Elle that it is hard for her to accept the criticism but that she gets it.

People end up wasting their time on the blogs or whatever, ranting away, and that's all right. I don't hate them for it, she said. Because tomorrow I'm still going to be the same person. I'm still going to do what I want to do.

Do you think the tweets were Rihanna's way of secretly communicating with Brown?