The singer is currently working as a judge on Simon Cowell's pop star search show The X Factor, and has been introduced by the music mogul by her maiden name Cheryl Tweedy.
Simon joked with the crowd about her name change as Cheryl - who requested a "quickie" divorce from her England soccer player husband Ashley Cole in May - walked into the audition room at yesterday's heat in London.
Simon said: "Who would like to hear from Cheryl&Tweedy;? It is, now, isn't it?"
An onlooker said there was a roar of applause for Cheryl as she walked in and the audience all stood up to welcome the Fight for This Love singer.
Another member of the audience said: "Cheryl's face didn't give much away. Simon was sort of joshing but she didn't laugh or look annoyed."
Cheryl, 26, is now going to have laser treatment to remove her Mrs C tattoo she has on the back of her neck.
The pop star cited unreasonable behaviour as the reason behind the end of their three-and-a-half-year marriage, after numerous women claimed to have slept with Ashley during their relationship.
