1. The X Factor – Britney Spears
In season 2 of The X Factor, Britney Spears made her mark with a reported 15 million dollar contract and coaching Carly Rose Sonenclar to 2nd place just before announcing she would not return for a second season.
2. American Idol – Paula Abdul
After being the only female judge for 8 seasons on American Idol, Paula Abdul left just before joining Simon Cowell for one season on The X Factor.
3. The X Factor – L.A. Reid
Music mogul L.A. Reid left The X Factor on a high note after winning his last of two seasons on the show in 2012.
4. American Idol – Jennifer Lopez
Joining American Idol vet, Randy Jackson, JLo took her talents to Idol for just two seasons before calling it quits in 2012.
5. American Idol – Steven Tyler
Bringing a cool rock n' roll feel to the American Idol judging table, Steven Tyler said his goodbyes to the decade old show after 2 seasons in 2012.
6. The X Factor – Demi Lovato
After a season filled with emotions, high-notes and jabs at Simon Cowell's love life, Demi Lovato left The X Factor after just one season.
7. The Voice – Christina Aguilera
With a serious career boost and three seasons under her belt, Christina Aguilera left The Voice to new female judge, Shakira.
8. The X Factor – Nicole Scherzinger
Famously sending home Rachel Crowe, Nicole Scherzinger spent just 1 season on Simon Cowell's The X Factor.
9. The Voice – Cee Lo Green
Kicking off Season 1 of The Voice, Cee Lo Green (and occasionally his fluffy white cat) held down 1/4 of the judging panel. Cee Lo called it quits after the close of the third season in 2012.
10. Ellen Degeneres – American Idol
The only non-musical judge to ever hit the Idol table was Ellen. Although she brought the laughs, she didn't stick around. Ellen left American Idol after just one season back in 2010.