It seemed like a perfectly glitzy night out when Madonna, clad in a jaw-droppingly beautiful Gucci frock, debuted her new movie, I Am Because We Are, at the Tribeca Film Festival last night. No, it wasn't another starring role in one of her husband Guy Ritchie's movies, à la Swept Away, but a serious documentary on orphans in Malawi — including footage of her very own adopted son, David Banda, before he became part of her brood. Madonna produced and narrated the film. Explaining her connection to the work she's done on behalf of the orphans in Malawi, including spearheading the aid group Raising Malawi, Madonna told New York magazine, "I myself feel like a motherless child. I grew up that way." Perhaps it's finally time to retire the "Material Mom" catchphrase.