Lucy (The Vampires of Venice)

Lucy was hired as the stripper for Rory Williams' stag night. However, the Eleventh Doctor swapped places with her so he would be the one in the cake. After bursting out of the cake, he said that she was outside in a bikini and asked if someone could let her in and give her a jumper as she was a lovely girl and diabetic. (DW: The Vampires of Venice) The Doctor later mentioned her when investigating Enamour's pressence, annoying Rory. (NSA: The King's Dragon)

Behind the scenes
According to REF: The Brilliant Book 2012, one of Rory's friends 'hooked up' with Lucy after the stag.