...with this, a closeup of one of Carole's more famed swimsuit shots:
I think there's a definite resemblance. While I wouldn't necessarily make Christina my number-one choice to portray Lombard, I definitely view her as a worthy candidate.
Incidentally, this topic was also discussed at the Yahoo! group "Fabulous Faces On Film." Candidates brought up at that site included Naomi Watts, Charlize Theron, Catherine Zeta-Jones and Nicole Kidman, although the latter two would have to get their hair lightened (Kidman has played blonde before, notably in "Bewitched").