WATCH: Worst Celebrity Plastic Surgery Disasters

We all know that stars constantly feel an intense amount of pressure to look their best, leading many to go under the knife.

But what happens when in an effort to enhance their looks, the opposite effect takes place?

From Tara Reid's botched boob job to Heidi Montag's frightening 10 plastic surgery procedures in one day, watch the video to see some of the worst plastic surgery disasters to hit Hollywood.