Katie Holmes has a true fan and friend in her “Dead Accounts” co-star Judy Greer. “Katie is great and the play is awesome and I’m having a great time doing it,” Greer told us at PH-D during a party for the premiere of a new film, “Playing for Keeps,” in which she also stars. But she quickly grew uncomfortable dishing on Holmes, saying, “I don’t want to talk too much about Katie and Suri . . . we’re becoming friends and I don’t want to jeopardize my friendship with her. I totally love her.”