Katy Perry and John Mayer: It's serious

After dating the likes of Jessica Simpson andJennifer Aniston, John, 35, has met his match in Katy, 28.

They're said to be keeping neighbours awake with their nightly love-ins!

‘She doesn't want to be just another conquest,' says a pal.

Katy was wed to ladies' man comedian Russell Brand for 14 months and their divorce was only finalised in July.

The pair got married in a lavish ceremony in India in October 2010.