They won't be competing against each other, but it's nevertheless on between Duets and The X Factor.
On the ABC Upfront party red carpet this week, John Legend - one of the four singers who will be teaming up with amateurs across the country on the new singing competition - was asked about the new X Factor judges, Britney Spears and Demi Lovato, and replied:
"You know it's interesting. It should be very interesting. I don't have much to say," Legend told E! News. "It's interesting when people, you know, are judging singing competitions when they aren't really singers."
Ouch! Interesting is one diplomatic word for it, yes.
Robin Thicke, who will also appear on Duets, gave the young ladies some credit at least: "Oh come on, everything Britney does, she excels at. Demi is a lovely young lady, and I'm sure they'll do nothing but make the show a lot more fun to watch."
Which of these X Factor judges has you most excited?