Man, I thought for sure it was Feist singing ...
Okay, I'm no expert on music, but, like millions of people, I found Canadian singer Feist's nifty "1 2 3 4" (above), which was used on an iPod commercial, quite appealing (in that it-keeps-running-through-your-head sort of way).
And I thought for sure the song with the lyric "I crinkle my nose" that's on the radio a lot these days was Feist -- the voice sounds identical to me. But it's not; it's someone named Colbie Caillat, and the song, it turns out (after some spelunking with Google) is called "Bubbly." Still, it's a nice cheery piece, and it makes me happy. :) You can hear/see it on YouTube here (and the Feist song "1 2 3 4" is here).
(And yes, I even like The Partridge Family. So there.)