Prince was rushed to hospital in a 'medical emergency' on Friday.

The 57-year-old was aboard a flight when he fell ill, forcing it to make an unscheduled landing in Illinois on Friday morning.

TMZ reported the singer's plane diverted to Quad City International Airport in Moline to make the emergency landing.

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Ill: Prince was been rushed to hospital in a 'medical emergency' after his plane was forced to make an emergency landing. He is pictured playing in Atlanta on Thursday night just hours before

He had had been suffering from flu for a number of weeks and was believed to be recovering, but took a turn for the worse in the early hours of Friday.

He was treated for three hours before being released; his rep confirmed he returned to his plane and is now at home.

Initial reports on his condition painted a much graver pictures, with one source claiming at the time he was 'not doing well'.

The Purple Rain hitmaker had performed at The Fox Theatre in Atlanta on Thursday night - the second of two back to back sold out shows - and had seemed fine during the concert.

No problems: The Purple Rain hitmaker had performed at The Fox Theatre in Atlanta on Thursday night - the second of two back to back sold out shows - and had seemed fine during the concert

Emergency landing: After leaving Georgia on a private jet around 11pm, he was only in the air for a around two hours before making the unscheduled stop at Quad City International Airport in Moline at 1am

Fans uploaded snaps to Instagram of him playing, with no apparent difficulty.

Pictures of the Piano & A Microphone gig are scarce online because there was a no photo/video rule in effect, enforced by ushers.

But after leaving Georgia on a private jet around 11pm, he was only in the air for around two hours before making the unscheduled stop at 1am.

This dude right here is the #Truth - Thank you for tonight my dear #Prince �� A photo posted by Luxury Sales Atlanta .com (@araenee_sells_atlanta) on Apr 14, 2016 at 8:30pm PDT

A photo posted by @face2facemuzik on Apr 15, 2016 at 1:53pm PDT

The shows themselves had been postponed from their original due date last week, after he was truck down with flu; but its unknown if this latest episode is connected.

According to Atlanta Journal music journalist Melissa Ruggieri who was at the show, when he apologized for the postponement the 'remnants' of his flu were audible - but his singing voice was flawless.

Tickets to the 80-minute show started at $99, with the best seats fetching up to $1,000.

Prince made his last post to his Instagram account - or Princestagram as he calls it - on Thursday: a black white screen.

But his 214k followers won't look at this as an ominous sign, as he - like Jaden Smith - does this all the time, possibly to frame the photos that remain.

I saw Prince last night and almost cried #dearlybeloved A photo posted by dellllle (@dellllle) on Apr 15, 2016 at 6:39am PDT