It has been the launch pad of some of music's biggest names, but this superstar decided to hit reverse on his career just for one day.

Kanye West left Jennifer Lopez struggling to regain her composure after surprising her and her fellow judges by auditioning for American Idol.

The 38-year-old rapper decided he would try his hand at starting from the bottom in San Francisco, California, on Saturday.

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Surprise! Kanye West decided to audition for American Idol in San Francisco, California, on Saturday

Wife Kim Kardashian captured the moment Kanye walked around the corner to perform for JLo, Harry Connick, Jr. and Keith Urban.

Kim posted a snap of the producer's monitor and it was clear Jennifer could barely believe her eyes when Kanye appeared singing an a capella version of his hit Gold Digger - including the line that name checks JLo.

Host Ryan Seacrest also shared a behind-the-scenes moment on Instagram showing an uncharacteristically smiley Bound 2 star excited after being sen through to the next round.

See more of the latest news, pictures and video updates on the American Idol auditions

Not so new talent: Wife Kim Kardashian captured the moment Kanye walked around the corner to perform for Jennifer Lopez, Harry Connick, Jr. and Keith Urban

Kanye West auditioning for American Idol. pic.twitter.com/vJveHArjGA — HIP HOP FACTS (@OnlyHipHopFacts) October 11, 2015

He's through! Host Ryan Seacrest also shared a behind-the-scenes moment on Instagram showing an uncharacteristically smiley Bound 2 star excited after being sen through to the next round

Feeling the music: Judge Jennifer sang along as Kanye mentioned her name while rapping verses from his 2005 hit Gold Digger

Proudly holding up his 'golden ticket' to Hollywood's final round to show Kim, Kanye looked as though he was like any other contestant that makes it through.

Ryan was also very excited for the rapper, jumping in the air to celebrate.

Kanye and his wife were certainly packing a lot in the less than 24 hours they spent in San Francisco.

After his big audition, Kanye had an even bigger performance to attend - going from wowing the American Idol judges to impressing the American President himself.

Gold winner! The rapper looked very pleased with himself as he left the Idol auditions

Team West: Kim made sure to be right by her husband's side through the process

Maternity wear: The reality was wore a tight ribbed dress with a turtleneck over her bump and a long silk trench coat

The rapper was the headliner at a Democratic National Committee fundraiser later that day.

President Barack Obama was, of course, the star of the show and even showed off some comedy skills playfully taking aim at Kanye.

Joking about Kanye's recent announcement he plans to run for president in 2020, Obama said: 'In case Kanye is serious about this whole POTUS thing - or as he calls it, ''Peezy''- I do have advice for him.

Muse material: It was no wonder the rapper name checks Jennifer in his spong, as she remains one of the sexist women in pop

Painted lady: The 46-year-old showed off her makeup artist's impressive version of a smokey eye

'First of all you gotta spend a lot of time dealing with some strange characters who behave like they're on a reality TV show. So you've gotta be cool with that.

'This is a second important tip: saying that you have a beautiful, dark, twisted fantasy - that's what known as 'off-message' in politics. You can't say something like that.

'And number three: do you really think that this country is gonna elect a black guy from the south side of Chicago with a funny name to be President of the United States? That is crazy. That's cray.'

Change of audience: After his big audition, Kanye had an even bigger performance to attend - going from wowing the American Idol judges to impressing the American President at the Democratic National Commitee

Despite being the butt of the President's humour, seems Kanye for once was able to take a joke as he bought the leader of the free world a gift.

Kim revealed on Instagram that Kanye had organised two pairs of his sold out Yeezy sneakers - the Boost 350s and 750 high tops - for the POTUS.

Whether Kanye's presidential bid is serious still is yet to be confirmed, however, he certainly seems to be pretty serious about winning the favour of the current President.

Peezy: Joking about Kanye's recent announcement he plans to run for president in 2020, Barak Obama said, 'In case Kanye is serious about this whole POTUS thing - or as he calls it, ''Peezy''- I do have advice for him'