The first step in creating a look that emulates the natural beauty and assets of women like J Lo, Liv Tyler, Angelina Jolie, and Nicole Kidman is to prime your skin. Then, either apply foundation first and dab concealer on, or dab concealer on first and dab foundation on. The idea is that if your skin is good, you can skip the foundation.
For our role model beauties, foundation is a base because they use very high quality, light weight products such as Laura Mercier Foundation, Origins Nude & Improved Bare Face Make-up, Bare Escuentuals Mineral Foundation or Stila Illuminating Liquid Foundation. They first apply the foundation to even out any imperfections. When under intense scrutiny, it is important to even out your imperfections and conceal any redness. 
To apply the foundation, use your fingers and a tapping motion to blend the liquid evenly over your face and neck. There is nothing more mortifying than a two-toned face one or two shades darker or lighter than your neck. Remember, a featherweight foundation can act as protection and the ultimate blender that allows concealer to be a subtle tool of miracle complexion perfection. And always, the rule of thumb is to thine own skin be true!