During Sunday's show, as Anton was told that he was safe and through to next week, he rather excitedly grabbed hold of Simon and kissed him on the face, accidentally knocking into the side of his eye.
Even as Simon stood alongside eliminated contestant Bupsi, who received the fewest votes, he struggled to say much after admitting he was in a "daze".
Simon told hosts Caroline Flack and Olly Murs that he was trying to "recover" after being "head-butted in the face by Anton". He said: "I'm a bit dazed."
Reacting to the head-butt on The Xtra Factor, Anton said: "I'm so embarrassed!", before quipping: "Oh my God, I touched him, I kissed a boy! And I liked it!"
Sunday night saw Bupsi and Alien Uncovered eliminated from the competition.
Speaking about the elimination, Anton said it was "bittersweet" to lose two acts. "You know what the game is when you go in but what you don't realise is how invested you get in other people, living together and going through the process, you become kind of family with people."
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X Factor's most shocking moments: