Troubled singers Rihanna and Chris Brown were seen entering a West Hollywood recording studio yesterday -- at separate times, not together. (the photo above is for illustrative purposes only). Rihanna's reps have dismissed rumors that Rihanna is reconciling with her abusive ex-boyfriend. But there is a new rumor that they are recording a track together -- possibly a remix of one of Rihanna's songs. Rihanna and Brown are expected to take the stage at the Grammy Awards tomorrow -- though not together. It will be their first time attending the Grammy's at the same time since the incident in 2009 when Brown savagely punched, bit and stomped Rihanna in a fit of rage that still resonates today. Brown has said he will not give interviews this year, and he is not expected to walk the red carpet.