Jerry Hall (search) is in trouble below ground.

Ads for her reality show, "Kept," (search) have been banned from London's subway system because the poster — which shows Hall surrounded by several half-naked men with her holding a leash wrapped around their necks — violates a rule banning the use of people as sex objects.

The London Underground, which operates the vast public transportation network, said the poster had been put up in four stations without permission.

"This advert breaches our advertising code relating to the depiction of men, women and children as sexual objects," a London Underground spokesman said Wednesday.

"Kept," which has already been shown in the United States, begins airing in Britain this week. In it, the 49-year-old former model and ex-wife of Rolling Stone Mick Jagger tries to find a younger man to be her boy toy. Twelve men will compete, with the winner receiving a six-figure cash prize.