1 of 51That's rather sexy attire for a freezing cold New York street, Katie Holmes. And we're not talking about the puffa coat.
Luckily, there's a professional reason for Katie's sudden public appearance in the smallest of nighties - she's filming a scene her new movie The Romantics.
But she's not the only star who's been captured in their bedwear...
Find all the latest about your favourite star
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