Margaret O'Brien having tea with her idol, Vivien Leigh.
"While in England, Margaret received a very special treat when she met her longtime idol, Vivien Leigh. ...[Margaret to Vivien] 'Miss Leigh, you are my favorite actress.'
'That is so sweet,' Leigh told her. 'Especially when you have so many to choose from.' Miss Leigh then moved closer to her and softly said, 'Do you want to know a secret? You're my favorite, too.'
After the tea, Margaret shyly asked for an autograph, something she rarely did. Miss Leigh went to a drawer and took out several photographs and allowed her to pick the one she liked the best. After signing it, [Laurence] Olivier asked her if she would like to have his autograph also. 'Oh, no, thank you,' she told him. 'I only want Miss Leigh's.' He seemed a little disappointed, but she hoped he understood how much Miss Leigh meant to her." --from the biography, "Margaret O’Brien: A Career Chronicle and Biography," by Allan R. Ellenberger
P.S. It's hard to tell, because I cropped this photo, but on the wall behind Vivien's head, is a four picture spread from a magazine featuring Vivien and New.