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6 January 2012, 09:04
The 'We Found Love' singer leaves more cryptic posts on her Twitter account.
Rihanna has revealed that she is worried she will never find true happiness.
The 'You Da One' singer has once again taken to her Twitter account to post seemingly mysterious messages, which this time insinuate she is not in high spirits.
Earlier today (6th January) she tweeted: "True happiness seems so impossible!!!!!" And shortly after she then posted: "Life is short...TOO short!!!"
The tweets follow on from yesterday where the Bajan star tweeted that she was finding it difficult to sleep.
"Waited all yr+Finally I have time off, time 4 rest n quiet.Suddenly all the silence is being drowned by my thoughts! No sleep #HEAVY #SCARY," she tweeted.
Speculation has been growing on the social networking site of a possible reconciliation with former boyfriend Chris Brown which has apparently shown concern amongst the star's close friends.
Meanwhile, the 'California King Bed' singer was recently named as the biggest selling digital artist of all time.