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The California Gurls singer wed British comedian Russell Brand in October and is now thinking of taking on his second name because she loves it when people call her "Mrs Brand".
When asked if she would take her husband's name, Katy replied: "I am, actually. When people try to get my attention, like if I'm at an event or something like that, and they want special attention, they go, 'Mrs Brand!' And I go shwoosh!"
Katy demonstrated the "shwoosh" by snapping her head around.
The 26-year-old singer also joked about 65-year-old Dame Helen Mirren - who stars alongside Russell, 35, in two new films, The Tempest and Arthur - and claims she is "very jealous" of Katy marrying the former lothario.
She told US TV talk show host Ellen DeGeneres: "Yeah, she needs to step off my man.
"Actually I kind of don't mind that someone else takes some of the responsibility because it's a lot of work."
Helen has become very close to Russell as they have worked together, and recently revealed how he had given her an unusual gift - his used underwear.
She said: "I am the proud owner of a pair of Russell's yellow underpants. Slightly soiled I might add."
Although he is known as mischievous and a consummate prankster, Helen added Russell was very much a professional on set.
She said: "He is an inventive and imaginative and immensely energetic person, but he's not wild and anarchic and out of control, not at all."
