There are many beautiful women in Hollywood, which made it even harder to do a list like this. However, we decided to take a look at some of the hottest female celebrities that are under 30 years old. Some of them are up-and-coming stars and some of them are Oscar-winning actresses, but they all will make you do a double take with how hot they are. Check out what 20 hotties we picked to make the list and see if some of your favorites are on here.