Madonna proved she really is the master of reinvention while on a visit to Berlin this week after she completely transformed her look in less than 24 hours.

The singer, who is approaching her 50th birthday, revealed greying roots during an outing in the city on Tuesday.

It appeared to be a rather startling oversight for the image-conscious star, whose newly shimmering complexion has made it clear she has no plans to age gracefully.

But by yesterday, Madonna was back in glamorous - and grey-free - form as she made her directorial debut at the Berlin Film Festival.

Hair raising: Madonna revealed her greying roots during an outing in Berlin on Tuesday

Back to glam: Madonna transformed her look in less than 24 hours, making a radiant appearance at the Berlin Film Festival yesterday

She wowed the crowed with her radiant look and flirty black frock, but her film Filth and Wisdom didn't have the same effect.

It received with only a smattering of polite applause, according to reports.

The film follows three young housemates in London who try to finance their dreams while working in unfulfilling jobs.

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Frock star: Madonna made her directorial debut with her film Filth and Wisdom

Madonna said at a news conference: “One of the themes that I explore in the film is struggle, and if I look back to the beginning of my career I can recall those moments of struggle like it was yesterday."

Filth and Wisdom started out as a short movie but grew into an 81-minute feature.

Madonna said she added scenes and fleshed out the characters after she "fell in love" with them and "decided that I wanted the story to go on more than 20 minutes."

Asked what the future holds, Madonna said: "I look forward to making more music and making more films - I'm very excited about both."