Prep your stomachs but prepare to queue. The popular American burger chain In-N-Out is making a surprise pop-up appearance in Singapore tomorrow.

For one day only, they'll be dishing out their signatures in limited quantities. Choose from three burgers like the Double-Double that comes with two cheese slices and two patties; Animal Style made with mustard-cooked beef patty and lots of grilled onions; and Protein Style burgers, a burger wrapped in lettuce instead of a bun. Judging from the snaking queues that formed last time they held their pop-up in 2012, this one won't be any different so be prepared to wake up in the early morning for some burgers and fries.

The stand will be located in Timbre @ Gillman Barracks between 11am-3pm and operates on a first come, first served basis.

Photo credit to Christian Razukas, 2006.