The children of the Maharajah of Baroda (late 1890s). Queen Victoria couldn't figure out which one was the only girl, so she lined them up & went behind them. A pigtail gave the little person away. (She's second from the left and became Maharani of Cooch Behar and a socialite.)

@UnamPillai the resemblance to Gayatri Devi (of Jaipur) is striking.