The couple sent out the invitations for their ceremony to friends and family and their wedding will reportedly take place in India later this month.
The white embossed cards said: "Meet you in Delhi in October. Dates to follow. Please allow seven days for this event."
India holds a special place in their heart because Katy and Russell actually got engaged at the Taj Rambagh Palace hotel in Jaipur on New Year's Eve last year.
Their wedding will be a Hollywood meets Bollywood theme and they have hired celebrity wedding planner Mindy Weiss to arrange their big day.
A source told the Daily Mirror: “Expect the most vibrant wedding of the year. It will be a mix of traditional Hollywood glamour with Katy’s hair and dress, plus Indian touches like henna art on her hands and feet, an Indian tiara and hair brooches.
“About 75 to 100 guests will be staying at a resort in India and the ceremony is going to be held at an ashram.”
Katy had her bachelorette party last month, so the wedding is definitely near. We can't wait until these two get married because we feel like they've been planning a wedding for the last 5 years.