Vera Wang sells wedded bliss, but her ex allegedly hands out herpes.

The designer’s former husband gave the STD to a woman he met through a dating Web site in December, according to a lawsuit.

Arthur Becker, 66, got romantic with a private nurse he picked up online, but refused to use a condom, the woman claims.

The woman, who doesn’t have any children, was then diagnosed with herpes and will be forced to give birth via Caesarean section if she gets pregnant, her lawyer, David Jaroslowicz, said.

Becker didn’t return a message.