If you're going to eat at Taco Bell, why not go for the whole enchilada -- or in this case, pizza. For a limited time, you can get a free dessert upgrade when you order a Mexican Pizza combo by presenting this coupon found on Facebook.

Taco Bell are celebrating their 100, 000 Facebook-fans milestone with this dessert upgrade coupon which entitles you to free cinnamon twists or caramel apple empanada with the purchase of a Mexican Pizza combo (combos also come with fries and a 20oz drink). You will have until May 27 to download your coupon, and up until June 3 to redeem it at participating Taco Bell locations in Canada.

There is a limit of one coupon per food bill per customer and this offer is not valid with any other promotional offers or coupons (and no substitutes will be allowed in place of the two dessert options.) Coupons are available for download when you "Like" Taco Bell's Facebook page and visit Taco Bell's Facebook coupon app found here. Enjoy!