Customers at the Qdoba restaurant on Mishawum Road can get free food today—if they don't mind a little PDA.

The nationwide restaurant chain is now in its third year of a special Valentine's Day promotion: "Buy one entree, share a smooch with someone special -- or someone willing -- and get a second entree for free," says Qdoba.

All kissing has to happen at the cash register, and no coupon is necessary. The promotion is happening nationwide.

And this year, there's even a new twist to the promotion -- the Qdoba Kiss Cam.

Snap a pic of the moment and share it via Instagram, Twitter or Facebook and you'll have a shot at winning one of three prizes, including free burritos for a year.

The deadline to submit your photo is midnight on Feb. 17. The winners will be announced Feb. 18.

The Woburn Qdoba is open normal hours, from 11 a.m. to 10 p.m., on Valentine's Day.