http://community.livejournal.com/ohnotheydidnt/11313261.html
(click at your own risk)

avril's mandarin isn't that bad -- it helps that since it's a song (a horrible one at that, one i wouldn't even listen to in english) she doesn't have to distinguish among the tones. (are there speaking parts in the song? i couldn't listen to the whole thing.) she actually curls her tongue on some of the sounds, which is a lot better than i've heard from some non-mandarin speakers.