'Till The World Ends' hitmaker Britney Spears has revealed that she thinks Katy Perry has a "good heart" and would like to collaborate with her if there's ever an opportunity for a joint project. 

During an interview with Dan and Maz on 2DayFM, the pop megastar explained that she had the pleasure of meeting Perry and would love the chance to work with her in the future:

"There's so many extraordinary and spectacular women out there right now who are doing so well, and she's definitely one of them."

"I actually met her (Perry) at the 'Smurfs' premiere. I think she was the voice of one of the Smurfs, and she's a good girl and she has a good heart and I've spoken with her briefly but we've never got the chance to really work with each other. But yeah, she's someone I'd really like the chance to work with."

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Watch Spears' music video for 'Pretty Girls', which features Iggy Azalea, below: