You can't cover or obscure your plate.. so even though it's clear, technically it's illegal.
By the letter of the law... even the dealership trim rings around the plate are illegal as they partially obscure the plate. I've never been pulled over for that (but many other things, when I was younger and even dumber than I am now...). Your mileage may vary, however.
Don't be the next RS.net statistic - If you drink, don't drive. You'll lose your licence, and the rest of us will laugh at you.