Johny Depp is a very popular person.He is a good actor and you can know him by the very popular film "Pirates of the Caribbean sea","Alice in Wondderland" and etc.Almost all people know him.
Leonardo DiCaprio is also popular actor.You can know it from the movie "Titanic".Also he was awarded to Oscar.
Emma Watson is a popular American actress. She became famous after the role of Hermione in Harry Potter. Later she was called to many other films and her popularity is growing up.