Over the weekend was National Twins Day. Rockford delivered double the fun in this photo gallery.

I didn't realize how many twins were in Rockford until I asked you all to share pictures of you and your twin or your twin kids on Facebook. Twins occur in about 3% of births. The twin birth rate has risen 76% since 1980. That's crazy. Probably due to IVF and fertility drugs. Check out all these doubles and see if you recognize any.