All of Hollywood's greatest stars had to start somewhere, right? Usually, that meant small roles in some of our favorite sitcoms. Find out where you've definitely seen some of the world's most popular celebrities before they were ever famous.
Jessica Alba in "The Secret World of Alex Mack"
Remember this iconic '90s show? "The Secret World of Alex Mack" was about a teenage girl with hidden superpowers, and Jessica Alba played Alex's crush's girlfriend. Her character's name was also Jessica, and she was featured in three episodes total.