
Cameron Diaz has an amazing and evil power -- the ability to make Kate Upton's massive boobs disappear.
As Cameron and Kate walked through the Sydney airport Friday -- not only was Kate NOT wearing a low-cut top ... she also pulled her jacket in a futile attempt to conceal her chest.
HUGE difference from Thursday when Kate was solo ... with her girls on display.

This has been going on for weeks now -- every time Kate goes out with Cameron and Leslie Mann to promote their movie ... the rack gets put away.
On behalf of humanity, we say -- Cameron must be stopped.