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Katy Perry said that she is 'homesick'.
A source told Showbiz Spy: 'Katy is the ultimate professional and determined to make every show she does perfect but when she's not performing, being on the road and away from Russell is really hitting her hard.
'She's been very tearful and tired. She and Russell are in constant contact by phone and email but it's not the same. They are both desperately trying to juggle their schedules to find time to see each other.'