I believe she is filming the new film directed by Eric Kot (I saw some behind the scenes stuff from their location shoot in Beijing just last night on the TVB celebrity gossip show), did you happen to see anyone else you might recognize? I believe pop singer Leo Ku (who I suppose isn't quite well-known to non-locals) is also in the film.
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My blog on Asian films - http://thegoldenrock.blogspot.com/
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"So one day we may find ways to get this Chinese guy some groove"