What a treat for Alex Preston to get to perform with his idol, Jason Mraz.

Alex Preston then joined Jason Mraz to perform Mraz's new song, "Love Someone."

If ever there was a perfect pairing between IDOL contestant and musical guest it was Alex Preston and Jason Mraz who sounded like they've been singing together for years.

Singer Jason Mraz was the guest mentor this week and helped the contestants mould their America's Request performances.

What a treat for Alex Preston to get to perform with his idol, Jason Mraz.

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