'American Idol' has just kicked off its newest season, with Nicki Minaj, Mariah Carey and country crooner Keith Urban coming in as replacements for former judges Jennifer Lopez and Steven Tyler. Even though judging panels on reality TV singing competitions like 'Idol' continue to change through the years, we want to know who your favorite judge of all-time has been.

More than a decade has passed since 'American Idol' first premiered in June 2002, and there have been some pretty big changes since the days when Simon Cowell, Randy Jackson and Paula Abdul reigned supreme. Like we said before, while many judges have come and gone in not-so-memorable flashes, Minaj and Carey's presence has definitely spiced things up again, with Keith Urban and Randy lending some neutrality to the drama.

Meanwhile, in the land of 'The Voice,' original mentors Cee Lo Green and Christina Aguilera have been ousted from their big red swivel chairs. Now, Shakira and Usher will join Blake Shelton and Adam Levine for the fourth season of the singing competition when it premieres in March 2013.

Finally, the 'X Factor' has undergone a lot of reconstruction since it premiered in the U.S. in Sept. 2011. First, Nicole Scherzinger and Paula Abdul were seated aside coaches Simon Cowell and L.A. Reid, but they proved unfit for the panel. So, Cowell recruited two superstars instead! Britney Spears and Demi Lovato joined in 2012, but Brit has already confirmed that she won't return for Season 3, so stay tuned for her replacement.

So, PopCrushers, who do you think has been the best reality TV show judge ever? Vote for your favorite star below!

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