Katie, 31, had been to watch the live results show at Fountain Studios in Wembley and, judging by her smile, she had a pretty good night!
Being a close friend of Simon Cowell's, it's no surprise Katie was given the chance to watch the remaining acts face their fate in the flesh during the latest episode.
Not only that, the inspirational star also got to watch both Nicole Scherzinger and Olly Murs take to the stage and perform their latest singles.
No wonder she looks so chuffed!
Katie dressed up for the occasion in a sheer animal print blouse, which she teamed with a pair of sexy leather skinnies. She topped off her look with a pair of coordinating flats and added a pop of colour with a bright red pout.
After the show had finished, Katie spent time meeting fans outside the studio before heading home to partner James and daughter Belle.
It was quite a night for X Factor fans, as Jay James was sent home in a shock elimination after finding himself in the sing-off with Stevi Ritchie. The judges were unable to reach a unanimous decision, and the public vote went in Stevi's favour.
But although Stevi has received criticism for remaining in the ITV1 show, he definitely has a supporter in Katie!
After the result was revealed, she tweeted: "Wooo hooo @THESTEVIRITCHIE is staying! #xfactor."