The 30-year-old seemed a little out of character as she wished Little Mix a "merry frickin' Christmas" and asked presenter Dermot O'Leary to repeat a question because: "I have no idea what you just said!"
And her over-enthusiasm prompted viewers to start speculating that she may have been enjoying the hospitality in the show's green room.
One fan tweeted: "Kelly Rowland IS DRUNK! what was that exchange Dermot?! not very professional. not very Kelly Rowland we've seen so far."
Kelly's repeated use of the phrase "y'all" also raised eyebrows among viewers.
But Kels hit back on her own Twitter feed, saying: "Nice try, but I wasn't under the influence, in ANY way..........just overwelmed by the crowds cheers!"
Hmmm, we'll give you the benefit of the doubt this time then Kelly.