stiletto

And since the audience, which is admitted in groups of 60 at 15-minute intervals, will largely be standing or walking on varied surfaces during the two-hour running time, stilettos are forbidden.

One studio manager recalled that her habit of striding across the studio in stiletto heels damaged the floor but no-one had the courage to tell her.

The teaser for the film gives nothing away - the famous red stiletto heel from the first film's promotional poster is appropriately joined by a second, identical shoe.

And I told Bruce, "I woke up at 50 in a thong and stilettos, happier than I've ever been."

It can be an actual stiletto heel or a wedge.