I meant to do this ages ago. Well, whenever it actually was question of the day.
Anyway. Yes. Lots. Mostly in a "fan getting stuff signed at a convention/signing/stage door" context, but nevertheless...
I'll try a list, but it'll be woefully incomplete:
Sophie Aldred, Daphne Ashbrook
Colin Baker, Tom Baker, John Barrowman, Andy Bell, Nick Briggs, Nicola Bryant
Noel Clarke, Vince Clarke, Charlotte Coleman, Nicholas Courtney, Paul Cornell, Beverley Craven, Raymond Cusick
Arthur Darvill, Russel T Davies, Peter Davison, Terrance Dicks
Paul Field, Janet Fielding, Carole Ann Ford, Stephen Fry
Mark Gatiss, Karen Gillan
Louise Jameson, Caroline John, Martyn Joseph
Bonnie Langford, John Leeson, Chris Lowe
Katy Manning, Sylvester McCoy, Paul McGann, Steven Moffat
Wendy Padbury, Billie Piper
Julianne Regan, William Russell
Micharl Sheard, Rob Shearman, Elisabeth Sladen, Matt Smith, John Stott, Sarah Sutton
Mary Tamm, David Tennant, Neil Tennant
Lalla Ward, Matthew Waterhouse, Deborah Watling, Anneke Wills
I may well end up bunging this entry in Memories and then adding to it when/if I remember anyone else. Of course, in some cases, YMMV as to who you define as "famous"...