The `Teenage Dream` singer and her husband-to-be, comedy actor Russell Brand, tried to avoid photographers at Mumbai airport on 20.10.10, with Katy seemingly determined to keep her `Nath` - a traditional piece of Indian jewellery extending from her right ear to her nostril - under wraps.
The couple then flew to the city of Jaipur before taking a three hour drive to the luxury Aman-I-Khas resort, on the edge of a tiger reserve, where they are believed to be tying the knot on Saturday (23.10.10).
Katy`s parents, Keith and Mary Hudson, had earlier arrived at the resort - where guests pay £600 a night to sleep in `eco-chic` luxury tents.
Other guests including pop star Rihanna, UK TV personalities Jonathan Ross, David Walliams and their wives and comedian David Baddiel were also expected to arrive yesterday.
Russell, 35, and Katy, 25, are believed to have booked the resort for a week, and hired wedding planner Mindy Weiss to arrange the ceremony.
They are rumoured have four days of activities planned for guests in the run up to the ceremony including a tiger safari and feast.
A source told the Daily Star newspaper: "Katy and Russell kicked things off by holding a Lagna, or engagement, ceremony."
Katy is also expected to be decorated in traditional henna designs on her hands ahead of the marriage ceremony, while it is rumoured Russell will arrive on a white horse.
Katy has called for privacy to allow her and Russell to enjoy their big day in peace.
She wrote on twitter: "The greatest gift u can give us is respect and love during this private time. (sic)"