Here are some addresses:

Bill Nighy
Markham, Froggatt & Irwin
4 Windmill Street
London W1T 2HZ
UK

Emma Thompson
Hamilton Hodell
5th Floor
66-68 Margaret Street
London W1W 8SR
UK

Colin Firth
Independent Talent Group Ltd.
Oxford House
76 Oxford Street
London W1D 1BS
UK


Alan Rickman
"Seminar"
John Golden Theatre
252 West 45th Street
New York, NY 10036
USA

Joanna Page
Independent Talent Group Ltd.
Oxford House
76 Oxford Street
London W1D 1BS
UK

Kris Marshall
Independent Talent Group Ltd.
Oxford House
76 Oxford Street
London W1D 1BS
UK

These are the ones I would try first, as they are the ones who I think will be easiest to get. Alan Rickman's address is VV and is valid up until 4 March 2012. I hope I've helped, although you didn't list some of the ones I have provided addresses for, but they are all in the movie.

For my moms birthday one of the present im going to get/make her is an book autograph collection from the stars in Love Actually. her favorite movie. I was curious if anyone knows if any of these addresses are sucessful or the stars have new addresses or VV addresses. If you could help even with knowing one it would mean alot!

Rowan Atkinson
Martin Freeman
Rodrigo Santoro
Laura Linney
Liam Neeson
Gregor Fisher
Bill Nighy