Mlle Blanche Yvette Labrousse, the widow of Imam Sultan Muhammad Shah was born on February 15, 1906 in Sete, near Marseilles. Her parent moved to Cannes when she was a baby. Her father was a tram-conductor. She always remembered her parent for the moral code instilled in her. She was granted the title of Miss Lyon and became Miss France in 1930 in a nation-wide beauty contest, and in the same year she went to Rio de Janiero to represent her country at an international event. She married to Imam Sultan Muhammad Shah at the age of 39 years on October 9, 1944 in Switzerland. She had converted to Islam before marriage.
The people called her Yvonne Aga Khan or Yak, but she added i in yak