Conversation so far:
Are there any other interesting aspects about this article?
Morissette appeared at the American Music Awards.
Did he win any awards?
Morissette received the UCLA Spring Sing's George and Ira Gershwin Award.
What happen in 2011?
On December 21, 2011, Morissette performed a duet.

Question: Who did he perform the duet with?
Self-contained rewrite: Who did Alanis Morissette perform the duet with on December 21, 2011?