Madonna's son doesn't think she's cool.

The 'Music' hitmaker's 14-year-old son Rocco previously joined her on stage during her 2012 'MDNA' tour and though he will be on the road with her for her 'Rebel Heart' concert series - which kicks off in Canada next month - he only wants to help out backstage.

She said: ''I think he's probably gonna work behind the scenes. ''He's not interested in performing on stage with me right now. There's way cooler things. Your mom is not that cool when you're 14.''

The 56-year-old star - who also has daughters Lourdes, 18, and Mercy, nine, and another son, David, also nine - has been spending 10-12 hours a day preparing for the tour and even has an aide following her around to remind her to stay nourished.

Speaking to Andy Cohen for Entertainment Weekly magazine, she said: ''I call her the food police.  'Are you eating? Did you drink enough water?' I'm like, 'B***h, get off my pole!' ''

While Madonna is looking forward to playing her new material, fans of her back catalogue won't be left disappointed by the shows.

She said: ''Of course, the thing I'm most excited about doing is my new stuff, because I haven't done it yet and it's fresh.

''But I realise that people want to hear my older stuff, so for me it's always a tricky balance trying to keep some kind of continuity, not only with sound, sonically, but also thematically ... a lot of times I have to take the songs and turn them inside out and make them more ironic than straightforward.''