"Cecilia is such a trusting creature. We cuddle all the time, and she has always slept in my bed," single Uwe Mitzscherlich, 39, told Bild newspaper.
"Our hearts beat as one — it's unique!"
Because marrying an animal is illegal, Mitzscherlich, from Possendorf, in eastern Germany, paid €300 ($428) for a television actress to play officiator in the ceremony, while his twin brother, Erik, served as witness.
The happy couple dressed up for the occasion — Mitzscherlich in a wedding suit and top hat and 15-year-old Cecilia, who loudly meowed her way through the exchanging of vows, in a white dress.