Madonna's daughter Lourdes is ''always in her heart''.

The 'Like A Virgin' hitmaker posted a sweet message to mark her daughter's 21st birthday on Saturday (14.10.17).

Sharing an old picture of the pair, she wrote on Instagram: ''Whether you are In Cuba.....,,,,,,,,. Or in Kenya ..... Or in our own backyard!! You are always in my heart. Happy Birthday Lola. La Princessa (sic)''

It comes after Madonna revealed she won't say 'no' to her children and would rather advise her kids than give them rules.

Speaking about her eldest daughter, she said: ''I'm not a fan of taking drugs, but I'm not gonna tell my daughter not to do things. I'm just telling her to be careful.

''[I tell her] never take a drink that you haven't seen somebody pour in front of you. Don't mix alcohol. Your basics, like be safe, do everything in moderation. That's it. That's all I can do.''

And Madonna - who also has Rocco, 17, David, 12, Mercy, 11, and five-year-old twins Stelle and Estere - believes it is important not to be ''judgmental'' of her children because she feels it is discouraging for them.

When asked if she talks about sex with her older children, she added: ''It's just a fact of life isn't it? Somehow, it's gonna happen sometime. It happened to you, so it's gonna happen to [Lourdes].

''All you can do is [stress] safe sex. Have discussions about it and encourage her to be open with you about it and not judgmental. Because then they won't feel like they can come to you and talk to you - ask you for your advice and stuff.''