Katy Perry and John Mayer are planning to marry in June.

The couple - who have been dating around 18 months - sparked speculation they were engaged when the "Prism" singer stepped out on Valentine's Day wearing a ring on her engagement finger and insiders say they have already found the perfect venue and asked the pop star's pastor father, Keith Hudson, to officiate their nuptials.

"They'd love a June wedding. They want to get married at the San Ysidro Ranch in Katy's home town of Santa Barbara," a source said. The ranch previously played host to the wedding of Gwyneth Paltrow and Chris Martin in 2003, and was also where John F. Kennedy and wife Jackie spent their honeymoon.

Superstition has already pointed to Katy - who was previously married to comedian Russell Brand, whom she divorced in 2012 - and John marrying, after she caught one of the bouquets of flowers thrown by a couple married during Macklemore and Ryan Lewis' performance of "Same Love" at the Grammy Awards. Tradition follows that the person who catches the bouquet will marry next.