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Katy Perry is said to be 'living on planes' in order to make her marriage work.
A source told The Daily Star: 'Despite working her butt off on tour, Katy's really making a huge effort to ensure she sees (Russell) as much as possible even if it means she's basically living on planes.'
They added: 'They said they would never go over a week without seeing each other as part of their 'marriage rules'
'But with her world tour and his filming it's proving difficult.
'It'll depend on how solid they are as a couple whether they get through this tricky time.'