Sharon Osbourne admitted it has been overwhelming to return to The X Factor as she declared: "I'm the nan of the panel."
She arrived at her first audition for six years in flamboyant style, flanked by bare-chested hunks wearing kilts as she made her way into the Hilton Glasgow Grosvenor Hotel.
Sharon Osbourne said she had never expected to be back on The X Factor
Her fellow panellists praised her comeback and said it would change the dynamic of the series for the better.
Osbourne was one of the original judges on the show, serving until 2007, and has been drafted back in to replace Tulisa Contostavlos.
As she attended the audition on Tuesday, she said of her return: "It's overwhelming. Honestly, it is. It feels natural, it feels like I should be here. I've missed you guys."
And asked whether she had ever envisaged a further stint on the show, she scoffed: "No, don't be ridiculous."
Osbourne said personality and "likeability" were as important as vocal talent.
"It's not just about the voice. You can have the best voice in the world and the oldest saying is 'they've got the perfect face for radio'. You've got to have the personality, the likeability," she said.
"My thing is: 'what makes you different from every other guy? We've seen 50 of you today so what makes you different from the other 50?' The actual answer that you usually get is 'this means everything to me'."
Her new colleague Gary Barlow said he was looking forward to seeing Osbourne in action.
"It's very interesting this time because there's two artists and two managers. That is a great panel right there because managers see different things than artists see.
"I always think when I'm looking at someone I'm comparing them to what I am and what I do, managers don't. They have a bigger overview. I'm very interested to see all of the experience Sharon has."
Fellow judge Louis Walsh said he was pleased to be teaming up with Osbourne once more, adding: "Sharon brings the madness out in everybody, she's going to bring the madness out in Gary as well."
He predicted there would be conflict "in a good way".
"We're all looking for different things. It's not all about the voice," he said.