The 41-year-old singer is attached to particular scents because of the memories they evoke.
She explained: “The scent of the ocean and salty crisp air takes me back to Santa Barbara, where I was born.
“And the scent of vanilla, which I’ve been wearing since I was 15.”
Katy is proud to work with Dolce and Gabbana because of their “creative boldness”.
She said: “I admire the work of Domenico Dolce and Stefano Gabbana.
“I love their creative boldness, unmistakable style and connection with their roots, which is evident in everything they do.
“They built this brand from the ground up, and it has evolved so magnificently over the decades.”
The Teenage Dream singer, who has a 5-year-old daughter, Daisy, with former fiance Orlando Bloom, shot the campaign for the fragrance on the Italian island of Capri and she had a wonderful time.
She said: “It’s beautiful topography is the perfect setting for the most incredible parties, romances, celebrations.
“There’s so much life and authentic Italian vibes, it’s like the whole of Italy on one small island.
“I brought my mum and her friend [as I shot the campaign].”