In public, Lando tends to play it cool and funny and he usually refers to you by your name. However, he once let his endearing nickname for you slip out during one of his livestreams.

"Lando?" You had called from the other room, needing his help with a task in the adjacent room

"Yes, sweetheart?" He had replied, not realising his mistake until people started to call him out on it. It became an inside joke amongst his crew he used the nickname against him teasingly