The couple dated on and off last year and got back together with assurances that this time their love would go the distance.
They even wrote us a song about it.
Despite Who You Love making us feel quite queasy, we were all for KP having some romantic success.
After rumours of an engagement just a few weeks ago, the pair have now reportedly ended their relationship.
The pair began dating after Katy's divorce from comedian Russell Brand was finalised in July 2012.
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