Looks like an innocent lady bug, but guess again-

Most people know what ladybugs look like, but can YOU tell the difference between a ladybug and an Asian lady beetle?
Lady bug Asian Lady Beetle
(Scott Bauer, http://www.ars.usda.gov/is/graphics/photos/apr99/k7033-14.htm)
There really isn’t much of a difference, besides the fact that the Asian lady beetles are an ever-growing invasive species nationwide. Asian lady beetles (Harmonia axyridis) are about 1/3” long and yellow, orange or red with 0-19 spots on their wings (Wisconsin DNR, 2002).
These lady beetles are native to Asia, but were imported into the United States back in 1916 as a way to control certain insect pests. They control aphids, scale and other soft-bodied arthropods.  However, it is their large numbers that lead to their nuisance. The lady beetle must find shelter in homes or in buildings over the winter.  If these beetles are squeezed or squashed, they ‘reflex bleed’ and release a yellow liquid from their leg joints and an unpleasant odor. This ‘blood’ can stain walls and carpet, which leads to humans dislike in them (USDA, 2000).
So these little buggers are beneficial to farmers, but not to many homeowners. To prevent them from entering your house, you can caulk exterior cracks. Once they’re in your house, you can sweep or vacuum them up. A patent application was filed for a trapping device developed by entomologist Louis Tedders from the Southeastern Fruit and Tree Nut Research Lab in Byron, GA, but the patent was denied (USDA, 2000).
Check out an aquatic invasive species—