The mk1 is Twiggy in her 1960s prime, driving a Lotus Elan along Carnaby Street with "love me do" on the radio.
The mk2 is Joanna Lumley as Purdey in the New Avengers, sandwiched between the bloke who sold coffee and the older one wearing the second most famous male corset (with the most famous being Captain Kirk).
The mk3 is Keira Knightley (that often?) buckling a swash in the Carribean.
But which one is the prettiest? That's an impossible question. I'd have Twiggy on Mondays and Thursdays, Purdey on Tuesdays and Fridays and Keira on Wednesdays and Saturdays.
And on Sunday I'd need a rest.