The singer is in the midst of a legal battle with ex-husband Guy Ritchie over custody of their 15-year-old son.
'It’s true, there is no love stronger than a mother for her son,' Madonna said of Rocco. 'And if I talk about it too much, I might cry.'
'But I would like to dedicate this song to him. It’s a love song for a man, but I know he’ll be one, one day,' she told the audience at Auckland’s Vector Arena.
'I hope he hears this somewhere and he knows how much I miss him,' she said before singing 'La Vie en Rose.'