Pair team up for the first time since 'We Found Love'
'This Is What You Came For' is set to drop on Friday (April 29)
'This Is What You Came For' will be debuted on Friday
Harris was also joined by Big Sean and John Newman during headline set
DJ denies tabloid reports of split with Taylor Swift and says he intends to sue for 'defamation of character'
David Guetta and Skrillex also rank highly on Forbes' annual list
One Direction's Louis Tomlinson and Nicki Minaj also got involved in the dispute
Superstar DJ says no-one else could have made the hit a success
DJ and producer also said collaborating with singer on Number One hit 'We Found Love' was a 'mad dream come true'
Cheryl Fernandez-Versini has Number One single with 'I Don't Care'