With an all-star cast of performers set to hit the stage at the 2015 iHeartRadio Music Awards, it must have been a headache for show organizers to choose who would open the show.

In the end, they chose Iggy Azalea -- and why not go with someone who's made a second home on radio over the last year?

Iggy was joined by Jennifer Hudson to launch the show with a performance of "Trouble," where the Australia-born rapper played sexy inmate to J. Hud's sexy cop.

The prison didn't look too bad, though -- there were gold toilets and some very talented dancers, plus hidden trick doors (which probably shouldn't exist behind bars).

The theme of the performance was reminiscent both of the track's official video, and very similar to when they hit the stage at the Kids' Choice Awards on Saturday night.

So, which one was better? Check out both tonight's and last night's below -- then hit up the comments to weigh in!

iHeartRadio Music Awards

Kids' Choice Awards