I was one of 22 artists selected by Topps to do some "sketchagraph" cards, which are new inserts for Star Wars Galaxy 6 (very rare, from what I understand: 1 in every 135 packs) featuring an authentic signature from a Star Wars actor along with an original sketch by the artist.
The list of signers includes: Mark Hamill (Luke Skywalker) Carrie Fisher (Princess Leia) Ray Park (Darth Maul) Jake Lloyd (Episode 1 Anakin Skywalker) Orli Shoshan (Shaak Ti) Amy Allen (Aayla Secura) Jon Berg (FX artist, cantina creature actor) John Morton (Dack Ralter) Mike Quinn (Puppeteer: Sy Snootles, Nien Nunb & more)
I did 2 of Mark Hamill's, 3 of Carrie Fisher's, and 5 of everyone else's (I think everyone had these same ratios). Basically Topps had the actors sign the cards in advance, then sent the cards to the artists.