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It seems there is never a dull moment for Rihanna and her closet pal Melissa Forde.

The superstar took part in what appears to be a very sexy and impromptu photoshoot, with the results spread across her best friend's Instagram account for all to see on Wednesday.

In the series of sultry images, the 28-year-old singer looks sensational in a racy, plunging lace-up black swimsuit by Suga Apple Swimwear, her peachy derriere and long, lean legs on show as she poses up a storm.