The couple are due to marry at a secret location 'somewhere hot' later this year.
Meanwhile, Katy has revealed some secrets of their marriage - including Russell's desire to kick off married life by attempting to start a family straightaway, reports the Daily Star.
"When we start, Russell won't want to stop," she said.
"He will actually make a very good dad. He really loves kids."I am just concerned about how many he will try and make me have.
"It wouldn't shock me if he tried to go into double figures. His dream is to have 11 boys and name them after the West Ham team," she added.
