That's the picture I had recalled seeing somewhere -- perhaps in a book, maybe at a memorabilia store (it has been so long that I've frankly forgotten). Well, as it turned out, that wasn't the only "multiple" photo of Carole + Carole taken at that session. Carole Sampeck came across another one, and has forwarded it to me...and now, I can forward it to you:
It's a charming picture, with Lombard's subtle, iconoclastic humor. It brings to mind all the actresses who have played "twin" roles over the years, such as Olivia de Havilland in "Dark Mirror" (1946), Bette Davis in "A Stolen Life" (1946) and "Dead Ringers" (1964), or on TV, Barbara Eden as Jeannie I and Jeannie II (the latter was the genie with the dark hair) or Elizabeth Montgomery as Samantha and her equally witchy cousin Serena (though the latter role was playfully credited to "Pandora Specks").
I thank Carole Sampeck for generously sending it my way.
P.S. My friend June, who founded the Carole Lombard group at the Golden Age Of Hollywood site (http://goldenageofhollywood.ning.com/group/carolelombardwomannotjustwifeof), drove up to Fort Wayne for the centennial celebration, and then returned to her native Texas. On the way back, she was in a traffic accident involving a truck near Dallas. She wrote, "All will be well, but currently we are mending, finally safely back at home, being waited on by friends and family. Please be thinking of us, and I will catch up with all of you as soon as I can." From what I gather, they should recover fully, but nevertheless, please keep them in your thoughts.