The 30-year-old singer was joined by former bandmates Beyoncé and Michelle Williams at the New York launch party for her third solo album Here I Am.
But despite still maintaining a close friendship, the X Factor judge insisted that there are no plans to join forces professionally.
'It's nothing we've discussed and we talk pretty much every week,' Kelly told The Sun.
But asked what song they would sing if they did get back together, she added, 'Anything a cappella. I would love for us to come and shut something down a cappella and just kill it.
'I remember when Wyclef put us on the spot at the MTV Awards, when we did Say My Name I look back at that, and we sounded so good.'