These Celebs Guest-Starred On Television Shows Before Their Big Break

Britney Spears in "How I Met Your Mother"

Britney Spears has been featured in tons of celebrity guest-starring roles throughout her career. She once had a two-episode gig on "How I Met Your Mother" where she played a receptionist who fell in love with Ted, but then wound up engaged to Barney. She also has earned roles on "Glee," "Jane the Virgin," and "Sabrina the Teenage Witch." 

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The More You Know

  • Actor Joaquin Phoenix was born in a cult, which might help explain why his siblings were named River, Rain, Liberty, and Summer. Their parents were members of Children of God group, which was founded in the 1960s.
  • Matthew Broderick was convicted of careless driving in a car accident in which two people died.
  • Robert Downey Jr. claims that Burger King saved his life from his drug addiction.
  • Kanye West used to work at the Gap.
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