It looks like a daylily.

Deutzia 'Chardonnay Pearls' looks similar and has opposite leaves.

I have no personal experience of this but could it be Zephyranthes Candida, commonly called the rainflower because it blooms after rainfall? Have a look on here: http://www.pacificbulbsociety.org/pbswiki/index.php/Zephyranthes Whatever, it is very pretty.

Thank you! I live in central Arkansas. It was so hot last summer everything died except this guy and even when we had a snow/ice storm this past winter it just kept going. It wasn't constantly in bloom but it held up. I am going to look for more seeds this weekend. Un-killable is a perfect plant for me.. :) Again Thank you!