The `Rehab` singer - who gave away Alexander McQueen dresses and designs by Luella Bartley - decided to have a mass clear out after moving house and told staff at a North London charity shop she has become addicted to cleaning in her underwear.
A source said: "Amy turned up in a people carrier with loads of stuff in bin liners. Top, top designer gear.
"You`d imagine half of it would be covered in fag burns and smell of wild nights out but it was all in tip-top condition. Amy was joking with the shop girls that she has become addicted to cleaning.
"She has just moved house and said it was therapeutic getting her Marigolds on in just her underwear and having a clear out."
Generous Amy - who has previously battled drug addiction - also told staff this will not be her only trip to the shop, promising she will return with more unwanted designerclothes in the future.
The source added to The Sun newspaper: "She promised there was more to come. The shop has been going like the fair since word got out."