Why am I talking about Jay Chou? Well he's releasing his Tour on DVD on January 25th, and remember that Jolin sang with him in June 2010 on stage Give me the time of a song from his album Capricorn.
And apparently this performance will be on his DVD! So if you are interested, here's the YesAsia preorder link:

Preorder The Era World Tour Deluxe with Jolin's appearance

By the way this performance was filmed by a fan a few months ago, I put it again here: