Nick holds the next stage of the competition at Cotswolds, and along with guest Mark Ronson, he has to decide which three acts will make it through to the live shows.
Seann, who recently moved from Australia to London, made sure all eyes were on him as he wore a bright red mesh outfit, towering platform boots and a gold belt.
He seemed over the moon to meet DJ and producer Mark, and we're guessing he blew them away with his powerhouse vocals.
But, it looks like things get emotional for Seann too, as he holds his chest and puts his hands up to his face after performing.
In a recent interview on the X Factor website, Sean said about his fashion sense: "I love the eclectic vibe. I can walk down the road in Camden and no one looks - actually, they look once, I'm a guy in a skirt, but they don't keep looking."
Seann also revealed that he is hoping to sing a Shirley Bassey track, if he makes it through to the live shows.
"I love older music and gravitate towards it," he said, "particularly epic material which is part of the reason I chose to sing Freddie for my audition. I went through literally 1000s of songs before I decided on that one. Now I want to sing Shirley Bassey."
Seann has a lot riding on X Factor, especially as he actually turned down a show in Australia for it!
"I had an opportunity to appear in a show in Australia but I gave it up for The X Factor," he revealed. "I was in The King and I in the chorus before, but YOLO - you only live once. I wanted to be on The X Factor."
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