I think they broke up after shooting 'Hunger' (a year before it came out on screen).
Maiko still lives in London apparently she's a singer.
http://twitter.com/maikospencer
There's a pretty recent interview of her here: http://shecaughtmelooking.blogspot.com/2011/08/interview-timewith-maiko.html
She's actually pretty good. It's just not my cuppa. Too bland. She also does gigs in LA and NY. Very pretty girl.
I think you're right. It wasn't the Venice FF, but the Cannes FF in 2008.