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RiRi announces the 'Bounce' star as her UK tour support act.
Rihanna has confirmed Calvin Harris will be joining her on stage during the UK leg of her 'Loud' tour.
"Calvin is the perfect fit," RiRi said.
"He is going to bring something unique and fun for the fans."
The tour kicks off in Belfast on Thursday 29th September and will see the 'California King Bed' singer performing across the UK until Christmas.