Devil had a dumb idea. She summoned Lucifer on herself and Hatty and sold her soul to Lucifer just to have a wedding with all three of them. "We are married!" Devil told Hatty. Hatty was forced into a big white wedding gown, and so was Devil. Lucifer was a goat.
"Blah blah skip the boring shit...I don't know what to say, we're married now!" Devil said. They all went on a honeymoon to hell because they were stupid enough to stick around with Lucifer and their souls were taken right after the ceremony.