Jamie Lynn Spears
Jamie Lynn Spears had a blossoming career on Nickelodeon until she got pregnant in her teens. The sister of Britney Spears, she's been a recluse ever since the birth of her daughter, about a decade ago. She's only recently been resurfacing into the spotlight.
Zoey 101
Zoey 101 was one of Nickelodeon's most popular series, featuring a cast of characters who all attended the same California boarding school. The writer is also credited for Drake & Josh and iCarly, but when Spears got pregnant, they pulled the plug on Zoey.