Rihanna Announces She Will Be Performing With Coldplay At The Grammys // Singer Also Tweets Series Of Sexy Pics From Hawaii. [Pics/Video]

Rihanna seems to be enjoying her vacation in Hawaii quite a bit. The singer who was caught on camera smoking weed a couple of days ago. Yesterday she sent out a series of sexy pictures to her 12 million Twitter followers, which you can check out below.

Riri also announced that she will be performing "Princess of China." at the 54th annual Grammy Awards with Coldplay.

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