I was obsessed with this as a child. Wikipedia says about them:“Hi! I’m Hilary Duff and you’re watching Disney Channel”
I don’t know if this fits the criteria, it was a UK #1 (albeit fell very quickly). I recall a few years ago a comment that this was better than anything N’Sync or the US boybands we’re turning out at the same point and it really was. An incredibly well made pop song.