Alison Brie was left red-faced when she suffered a "peeing incident" while wearing a girdle on the set of Mad Men. The actress, who starred as Trudy Vogel on the much-loved show, told Justin Long on his Life is Short podcast that the embarrassing moment happened while she was wearing the restrictive undergarment - which she described as like "biker shorts that go all the way up to your ribs (that also have a) small hole in them".