Jessie J Parties With Katy Perry Tour Support Ellie Goulding

Ellie Goulding showed up to support Jessie J at a Blackberry launch gig after the news came out she'll be replacing Jessie on Katy Perry's tour.

It was announced this week that Jessie J has been forced to pull out of supporting Katy Perry on her US tour because her foot isn't healing quickly enough, so Ellie Goulding stepped in to take her place.

But there appears to be no rivalry between the two after Ellie cheered on Jessie at a Blackberry BB7 and BBM Music event in London and then headed to Jason Derulo's birthday bash with the 'Price Tag' singer afterwards.

Jessie performed for the likes of Rizzle Kicks, Wretch 32 and Tinchy Stryder, then hit the town with Ellie to celebrate Jason's birthday and album launch at a posh party.

Despite cancelling the dates supporting Katy Perry in the US, Jessie J is still set to perform across the UK on her 'Heartbeat' tour which kicks off next month.