It's not like there's not precedent here, however. Follow the jump for more, including a glimpse at Knightley's previous brush with the 'brush.

A little research at Vantage would likely have revealed Touchstone's own means of dealing with rack challenged starlets, as recalled over the weekend in published reports: Photoshop first, and ask questions later:

The actress drew negative attention in 2004 with her larger-than-usual breasts in publicity stills for King Arthur.

"Those things certainly weren't mine," Fox News quoted her as saying in 2006. According to Knightley, the studio marketing team was behind her suddenly C-cup breasts, but gave her final approval on the photos.

"I was like, 'OK, fine. I honestly don't give a s—-,'" she recalled.

Alas, after laying off the top-secret crew whose muscular augmentation of Daniel Day-Lewis's moustache put There Will Be Blood over the top in 2007, Vantage brass have lost their secret weapons in the even more subtle art of bosom heaving — a craft having long since fallen out of favor with critics from Scarlett Johansson to Liz Smith. But it could be worse — like that time Into the Wild attempted to pass off Emile Hirsch as a leading man? There are some miracles not even Photoshop can approximate.

• Keira Knightley refuses breast enhancement for 'The Duchess' [NYDN]

Jessica Alba's not lacking in the mammary department, yet producers still felt the unwatchable Into The Blue could benefit from a little boost for Alba:

Emma Watson was not a girl but not yet a woman when Harry Potter: The Order Of The Phoenix came out, but marketers wanted her to be a woman, goddammit!

Perhaps the flattest of them all, Keira Knightley, famously had her barely-there bust bazoomed on the King Artur poster in an attempt to get more people to ignore how boring films set in the Middle Ages tend to be:

And yes, we did say Lindsay Lohan's miraculous rack was enhanced in the past, but it was actually quite memorably reduced on the Herbie poster so as not to scare the kiddies:

• ACTRESS KATE HUDSON GETS A DIGITAL BOOB JOB TO PROMOTE NEW MOVIE [Daily Mail]