Calcification of the gallbladder wall (porcelain gallbladder) is an intense structure and uncommon manifestation seen in chronic cholecystitis and resulting from chronic inflammation of the gallbladder wall. Patients with porcelain gallbladder are usually considered not at risk of acute cholecystitis. However, sporadic cases of cholecystitis on porcelain gallbladder have been described in literature. Gallbladder perforation is a rare entity and may complicate on acute or chronic cholecystitis in a non-calcified gallbladder. We report an unusual case of acute cholecystitis with perforation in a porcelain gallbladder.