Dolly Parton's world-famous breasts have forced her to postpone her upcoming tour.

The '9 to 5' singer - who was due to begin her North American tour at theend of this month - has been told by doctors to rest because of the damageher huge DD chest was doing to her back.

The surgically-enhanced star said, "Hey, you try wagging these puppiesaround a while and see if you don't have back problems."

Dolly - whose latest album 'Backwoods Barbie' is her first mainstreamcountry LP in 17 years - will now have to take it easy for up to eight weeksbut is hoping to be back on the road by April.

In 2004, Dolly revealed she was considering having a breast reduction torelieve the pressure on her back.

The 'Jolene' singer said, "My boobs are killing me - and I don't know if Ican stand the pain any longer. They have been a trademark for me - but I'vepaid one hell of a price."