Katy Perry's in Europe right now with her California Dreams tour and during her show in Sheffield, England recently she blended her latest "The One That Got Away" with Adele's "Someone Like You"!  Thanks to cell phones recording concerts these days, the performance was caught on tape!

The audience sang along to every word and then Katy wraps it up and finishes with "The One That Got Away".

The California Dreams Tour 2011 with Katy Perry will be back in the states September 7th at the AT&T Center in San Antonio and will wrap up shortly before Thanksgiving.

And for comparison, here's Adele's "Someone Like You".