Is this a stock lip with vents in it?
The lip that's on the car now is higher than the lowest point of the side skirt. I voted paint it, but thinking again, before spending money on paint...first you may want to buy another lip that will be at least as low as the lowest point of the side skirt. (You could get good money for selling the existing lip.) Also, looking at the picture below, the side mirrors (JDM?)have a different shade of white.
I noticed in the picture below that the rear bumper and wing appear to have a different shades of white compared to the rest of the car.
Why not paint the lip, side mirrors, rear bumper, and wing simultaneously? Also, you may want to re-shoot the rear add-ons so that you're assured that they match the bumper.
Compared to other colors, it's relatively more difficult to color match white. If you paint the pieces at different times, the pieces will have different shades. And with white, varying shades are easily discerned. A car with nice add-ons, that has a paint job that looks like a patch job is not so nice.:nono:
Save time and money at the shop by painting all the pieces together.
That's a lot of painting. You might as well paint the entire car. J/P.:icon_bigg . (Well, not really, if you have the money to do it. The car will look better since everything will match.)