The singer wore a white tank top and a pair of lacy red and white polka dot underwear for the celebratory post.

This week's Vintage Pop Stardom episode of Greatest Pop Stars looks at Madonna's 'Bedtime Stories'-era pivot to a more adult pop (and film) stardom, and why it resonates 30 years later.

The Queen of Pop posed on her bed in various relaxed positions ... from celebrity news to compelling human interest stories. Madonna and future husband Sean Penn met on the set of her iconic ...