Diana's spare gown expected to fetch at least $90,000

Princess Diana's spare wedding dress — a replica made in case the one she wore got damaged — is to be auctioned.

Diana tried on the ivory silk gown, an exact copy of the dress she wore, on the morning of her wedding, auctioneer Cooper Owen said Wednesday.

The only difference between the dresses is that the actual one she wore had Queen Mary's lace sewn on to the front, while the replica had a copy of the lace, the auction house said.

The dress is expected to fetch more than $90,000 at the Dec. 7 sale in north London.