Lordy, lordy look who's 40! No, seriously!

Heather Graham proved that 40 is the new foxy as she flaunted her toned and trim figure in a revealing pink string bikini.

The "Boogie Nights" star accessorized with a floppy straw sun hat and dark sunglasses as she showed off her flat stomach while vacationing on the Italian island of Ischia.

Roller Girl would be proud! We're just jealous.

Check out Graham in her sexy two-piece, plus more bikini-clad stars in the below gallery:

In other swimwear news, check out Serena Williams' stunning swimsuit shoot.