Well, Cee Lo isn't quite irrelevant. He had one of the biggest hits and viral smashes of 2010/11, so it's really not about how big someone is. I'm not sure how I feel about her doing this, but if she thinks it will help her in the long-run, then more power to her.
Isn't she friends with Lily Allen? They are prank buddies in fact. Would be interesting to see her stuck on the same stage with Cheryl for a couple of months. Oh the chemistry.
It would have been great for Adele if she was trying to make it into the music business, but she clearly doesn't need it. Her career is massive at the moment!