The pair are planning to tie the knot in Hawaii in June 2013.
Ditto – who is currently in London promoting the band’s new album ‘A Joyful Noise’ and has been joined by Kristen for the trip – said: “I’m getting married next year to my partner Kristen in June.
She might be somewhere here, in the hotel, walking around. I’m doing it in Hawaii because my girlfriend is from there.”
However, one potential guest, The Gossip’s female manager, wants the couple to say their vows in April because she can’t make the June date but Beth won’t be swayed.
The 31-year-old musician laughed: “I’m not getting married in April because it’s the raining season there!”
Ditto’s bandmates Brace Paine and Hannah Blilie are both thrilled for the couple and can’t wait for the nuptials.
Hannah said: “It’s gonna be great.”
Ditto’s beautiful engagement ring has a flower-shaped setting with a round diamond.
The couple knew each other for several years before they became an item because Kristen worked as the ‘Standing in the Way of Control’ singer’s assistant.
Although Beth Ditto had developed strong feelings for Kristen she waited until her nine-year relationship with transgender Freddie Fagula ended in January 2010 before embarking on a romance with Kristen.
She previously said: “It was something that I kept hidden deep inside of me. But everyone knew. Even people are parties and clubs would be like, ‘When are they (me and Kristen) going to get together?’ There was always a little guilt inside of me because I felt I was cheating, but I never cheated.
“We never did anything … I dated Freddie for nine years, and I was always worried it was going to end. With Kristen I never worry about it ending, I just feel completely full and whole.”
‘A Joyful Noise’ is scheduled for release on May 14.