The Toxic singer was visibly moved when the man – whose identity has not been revealed – took to the stage at San Francisco’s Oracle Arena but remained “calm and supportive” when he confessed to her that he is gay.
As the man stepped out, Britney exclaimed: “I know him. We did a duet together 10 years ago”, 4Music reports.
It has been confirmed that The X Factor USA will return to US TV on 12 September, with the second episode airing a day later.