Lonely hearts looking for a Valentine’s Day romance by using one of the many popular dating apps could end up with more than dinner and a little cha-cha-cha.

They could end up with a virus — on their smartphone.

More than 60 percent of the most popular dating apps are vulnerable to hacking, according to a study out Wednesday.

Non-secure technology on these apps could see those with passion in their hearts get credit card info stolen as well as have the hackers eavesdrop on their most intimate conversations, the study found.

And the cyberattacks can happen even when not logged onto the app, according to the study by IBM Security, which analyzed the top 41 dating apps on Android devices.

IBM found that 63 percent — or 26 of the 41 — suffer from what it called “medium or high severity vulnerabilities.”

And businesses are vulnerable, too.

Nearly 50 percent of the businesses analyzed by IBM Security — one of Big Blue’s fastest-growing divisions — had employees with at least one dating app installed on mobile devices used to access corporate info.

This could allow hackers to hijack corporate data and personal information.

“Consumers need to be careful not to reveal too much personal information on these sites as they look to build a relationship,” said IBM security vice president Caleb Barlow. “Some users may be engaged in a dangerous trade-off — with increased sharing resulting in decreased personal security and privacy.”