"They are definitely going to get engaged very soon," a source close to Katy exclusively told Hollyscoop, saying that the couple have been looking at engagement rings together. "She wants a green diamond, since green is her favorite color. They want to have a small wedding, one of those you don't hear about until it is all said and done. They live with each other now and are practically already husband and wife ... Katy knows that John is her soul mate and everything she has been through has led her to him. John has said he will never love another woman like he loves her. She has redefined his definition of love."