Katy Perry is too busy to have children.

The 'Teenage Dream' hitmaker - who is engaged to Russell Brand - admits she would love to start a family with the British comic but is currently too focused on her career.

She said: "I see myself as a professional right now and hopefully when I decide it's time for children, I'll be able to devote myself to that."

The brunette beauty also revealed she fell for the 35-year-old star because of his "eye for detail" and sense of humour.

She explained to Britain's OK! magazine: "His eye for detail was so impeccable, he made me realise he was listening and understanding me completely and wanted to jump into my world.

"I have always been open to someone who would really challenge me emotionally, spiritually and mentally and he really covers those bases.

"And we both have a sense of humour - we play practical jokes on each other. We make each other laugh and that's what keeps us connected in one way."

Katy - who got engaged to Russell in December after a whirlwind romance - is constantly thinking about her impending nuptials, but refuses to give away any information.

The 25-year-old star said: "I am always planning and planning and planning.

"I hope that it will be this year but that's the extent I will share."