Rihanna and Cheryl Cole collaboration will happen: Will.I.Am

London: Rapper Will.I.Am says the collaboration between singers Rihanna and Cheryl Cole will happen when they find the right song.

The 37-year-old musician, who is planning about the collaboration for quite some time, said it will be a blast when it happens, reported a leading daily. "Rihanna and Cheryl will be great when it happens. I first told Rihanna about Cheryl in 2009 when I said she`s like the princess of England. "No disrespect to the real royals but Cheryl`s the pop princess and I`ve been telling Rihanna, so hopefully it will happen soon," he said. PTI