Amy WinehouseAmy WinehouseAmy Winehouse is back in hospital.

The singer was reportedly admitted yesterday to a private clinic, after falling ill on Sunday.

So what's happened?

Apparently, Amy fell foul after having a terrible reaction to medication.

Her spokesperson told the Daily Mirror: "Amy had a bad reaction to the combination of medication she has currently been prescribed."

We are unsure of what type of medication Amy was taking, but it appears it's in relation to her drug rehabilitation.

"Amy is on a drug replacement programme and has had bad reactions to her medication before. Doctors want to sort out why this is happening," a friend of Amy's told the paper.

Amy missed husband Blake Fielder-Civil's court appearance yesterday, because of her trip to hospital.

Blake was in court to apply for a reduction in his 27-month sentence for grievous bodily harm, and perverting the cause of justice.

He was released from Pentonville prison on the 5th November and moved to a drug rehabilitation centre in Surrey.

The condition of his release was that he remain at rehab to complete the rest of his term.

It's unknown which private clinic Amy is recovering in and when she will be released.