That secret sauce millions around the world love so much could be yours tomorrow. Are you feeling lucky?

McDonald's restaurants in the Rockford area and celebrating the newest members of the Big Mac family, the Mac Junior and the Grand Mac.

If you're wondering what the difference is between the new additions and the traditional Big Mac, I've got the answer.

McDonald's describe the Grand Mac and Junior Mac as follows.

The Grand Mac sandwich takes its name pretty seriously. It’s made with two 100 percent pure beef patties for a total of one-third pound* with two slices of melty American cheese and iconic Special Sauce, served on a larger sesame seed bun with crisp lettuce, minced onions and tangy pickles; a literal and figurative mouthful. Each burger patty is seasoned to perfection with salt and pepper in McDonald’s kitchens. The Mac Jr. sandwich is a single-layer burger that’s easier to eat on the go. The 100% pure beef patty packs in all the flavor of the Big Mac sandwich without the middle bun.

As part of this nationwide celebration McDonald's will be\ randomly giving out free bottles of Mac Sauce, but there's a catch. McDonald's says you must say the code phrase, "there's a Big Mac for that."

Remember, there are only 10,000 bottles of the "special sauce" being given away nation wide. Consider this a larger version of Willy Wonka's golden ticket giveaway.

Also, though many say the secret sauce is Thousand Island dressing - it's not. With that being said, I'll be your BFF if you score an unopened bottle of Mac Sauce and give it to me.

Don't forget to join Shannon Zimmerman at McDonald's in Belvidere from 11am-1pm on January 25th and try the new Mac Junior and Grand Mac.