Christie Brinkley's not really starring in the musical Chicago - she's just been employed by the Cambridge Theatre to make girls half her age go green with envy every time she steps out.
Or, at least, that's how it seems to us.
The CoverGirl star plays Roxie Hart in the musical, a role that has also been filled by Brooke Shields and Ashlee Simpson.
The American actress looked fantastic again last night as she left another London performance in a chiffon navy dress, teamed with a white belt, mac and cool trilby.
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We love the look - and still can't believe a 57-year-old has legs that look that good...