Watch Extreme Cake Makers Season 4 Episode 21 Online

In London, extreme cake maker Nastassja brings a touch of sunshine to a sweet 16th party, when she's asked for a cake with a tropical vibe. Going for a two-foot high pineapple head design, this outrageous cake boasts five kilos of gold fondant skin, wafer paper leaf hair, coconut sunglasses and a water melon nose - and hides a sweet surprise inside. Cake art meets street art as Lancashire baker Rosie's asked to make a 3D cake version of a colourful 2D graffiti painted tropical bird for the opening at a new creative space in Manchester. Molly faces a new challenge with a giant spider cake.