Although Lilian and Leopold had originally planned to postpone their civil marriage until the end of the war, Lilian was soon expecting her first child, necessitating a civil marriage, which took place on 6 December 1941.
Meskipun Lilian dan Raja Leopold awalnya berencana untuk menunda pernikahan sipil mereka sampai akhir perang, tetapi Lilian nantinya hamil anak pertamanya, yang mengharuskan sebuah pernikahan sipil, yang berlangsung pada tanggal 6 Desember 1941.