This star's not afraid to bare all ... stripping down to some tiny lingerie, showing off her sizable assets -- and, we're not talking about the massive bank account she's got! This social media ...

Before this sweet baby -- bundled up after bath time -- was on the cover of every magazine under the sun, she was just growing up with her sisters in Calabasas, California ...

There's something to be said for parents supporting their kids, even when they pose naked together for British Vogue ... and we wanna know if you can guess who this model mother is! We caught up with ...