Walsh caused controversy on the results show last weekend when he seemingly chose finalist Rylan Clark over Carolynne Poole to be sent home before changing his mind and sending it to Deadlock.
It was then claimed that the result was fixed and Walsh, who is mentoring the bands this year, was told to take it to the public vote by producers.
Yesterday evening, the ITV show's host Dermot O'Leary, who recently defended his actions during the results show, joined the stars to discuss the furore at the Arts Club in Mayfair.
Scherzinger and Walsh seemed to be on friendly terms as they hugged outside the club, while Gary Barlow and Tulisa looked downcast as they left.
See pictures of The X Factor's first results show below: