An advert featuring a model wearing Stella McCartney lingerie underneath a fur coat has outraged the British designer, prompting her to threaten legal action. McCartney, an avid animal-rights campaigner, was reportedly angered after seeing one of her black lace bras together with a mink fur coat in an advert for Mayfair fur boutique, Hockley.

"Stella went absolutely ballistic when she saw it,' a source told The Mail on Sunday. "I have never seen her so angry. She hit the roof and said that she planned to sue."

"She didn't see any proofs, she just saw the campaign. It's a monumental cock-up."

The ad, which also appears in the latest issue of Vogue, has forced Hockley to issue an immediate apology.

"Hockley both requested and was told that the item was a vintage piece and apologises for any embarrassment caused to Stella McCartney. It is not Hockley's intention to use the image again," a spokesperson for the company said.