Rihanna appears to have posted yet another hint at how things are going with Chris Brown.

The 24-year-old pop star took to Twitter on January 11 to post: 

She wasn't specific about what this is referring to, but she seems to be taking the opportunity to vent some Chris Brown-related frustrations.

The day before, she posted the following message on Instagram: "I have to stop saying ‘How stupid can you be’  I think people are starting to take it as a challenge.” 

Could these be signs that things between Rihanna and Chris aren't exactly shining bright like a diamond lately?

Sources: TwitterInstagram