The network announced its participation in the film just days after Allen unveiled that Cruz would have a role.
Through its production department Ensueno Films, Antena 3 will co-produce with Mediapro and Letty Aronson's Gravier Productions. The network has also acquired broadcast rights.
With no confirmed title or shoot dates beyond summer 2007 in Barcelona, the film will be Allen's first in Spain. The director is expected to travel to Barcelona with his family and production crew in June.