The ad's been running for a while now, but Jean just spotted this disclaimer at the end of AT&T's "Blanket" commercial last night: "The artists Christo and Jeanne-Claude have no direct or indirect affiliation or involvement with AT&T."
I will assume they tried to contact Christo by calling him on his iPhone, but they got cut off.
AT&T Rethink Possible - Blanket Commercial [search youtube if the link is broken]
Previously: The Gates Bill