Backing vocals on which DW song?

[AbbiJoy78]

Hi Christine fans! I'm new....and I have a question that I hope hasn't been answered a hundred times. It's really hard to go thru all the old threads, so forgive me to ask again.

I have a friend who is very into Dennis Wilson, and made a mix CD for me. He told me to listen for Christine in one song. He thought it was "Love Surrounds Me". Then he said maybe it was "Baby Blue." I am wondering if maybe there are no vocals, but just piano parts she did? Can anyone shed some light on what her contributions were, what songs, and any tidbits/stories you might know?

Thank you!!!