The young singer joined Tulisa, Gary Barlow and Louis Walsh to walk the red carpet outside London's O2 Arena.
Writing on Twitter, Rita wrote today: "IM HERE…… I CANT BREATHE! X-FACTOR….. IM JUST LIKE YOU REMEMBER THAT. IVE JUST STARTED TOO IM HERE TO HELP"
Rita, 21, follows Leona Lewis and Geri Halliwell in becoming a 'contender' to become the new fourth judge, follow Kelly Rowland's exit earlier this year.
Sources have claimed that X Factor boss Simon Cowell is keen to get Rita to join the panel full-time, and that today's auditions will act as a trial for her.
Let's hope they go a bit better than the Liverpool ones with Geri last week!
Browse the pictures below!