Having already seen Geri Halliwell and Leona Lewis take to the X Factor judging panel, it was the turn of Rita Ora.
Taking to Twitter ahead of her appearance, the star wrote: "IM HERE...... I CANT BREATHE! X-FACTOR..... IM JUST LIKE YOU REMEMBER THAT. IVE JUST STARTED TOO IM HERE TO HELP!
And that's exactly what she did. With the audience cheering for her as soon as she arrived, the 'R.I.P' singer took her place alongside Gary Barlow, Tulisa and Louis Walsh in the O2 arena, where she looked like happy and relaxed whilst waiting for the auditions to start.
As hopefuls performed, X Factor pros Gary Barlow, Tulisa and Louis Walsh set about giving their feedback, some of it being a bit harsh...ahem Gary. However, Rita decided to go down the truthful yet positive criticism route by telling one hopeful that although they did a good job on the song they performed, it wasn't right for competition.
The star. who opted for a white dress and short white tuxedo jacket for her stint as a judge, also looked like she'd struck up a good friendship with fellow judge Tulisa, after telling an act that she was telling "T" that she had a good feeling about them.
We liked what we saw from Ms Ora, will she replace Kelly as the permanant judge?
The X Factor judges arrive in London!