Just when the judges on American Idol thought they'd seen it all, the next Kanye West walks into the audition room.

Oh wait. Actually just the straight up original Kanye West.

The rapper left Jennifer Lopez in giggles after surprising her and fellow judges Harry Connick, Jr and Keith Urban on the US talent show.

Wife Kim Kardashian caught some of it on camera from the producers' gallery in San Francisco.

The 38-year-old performed an a cappella version of Gold Digger (including the J.Lo name check) at the audition.

And yep - he made it. Kanye got his "golden ticket" through to the next round in Hollywood.

Later, Kanye headlined a political fundraiser for Barack Obama's Democrat party.

And the president even had some tips for the rapper - who's hoping to run for US leader himself.

His advice included to be cool dealing with people who behave like they're on reality TV.

The rapper says he's had lots of support since announcing plans to run for election.

He thinks it's because he's seen as "extremely thoughtful" and "probably the most honest celebrity we have".

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