One is the loneliest number for Katie Holmes.

The marketing campaign is in full force for Mrs. Cruise's B'way debut in Arthur Miller's All My Sons with posters blanketing Gotham, an official web site and e-card trumpeting the revival's opening, yet the play's MySpace page only has one friend after four days.

That would be the ubiquitous Tom, the founder of the social networking site, who is automatically added to each new profile.

Yes, "The masterpiece no one should miss. The cast no one can believe. The event everyone is talking about" MySpace page has just one friend stars John Lithgow, Dianne Weist, Patrick Wilson and a Thetan-enriched Katie Holmes in the diminutive but pivotal role of Ann Deever caught in the steamy crossfire of All My Sons.