Do you know what kind of flower this is?

Over the last three days these flowers popped up in our flowerbed. I think they usually bloom around the beginning of August. I'm not a flower person so I don't have a clue what they are. Cutie Pie pulled this one off it's stem.

 Several people have asked what they are called. If you know please leave me the answer in the comment section of this blog post or on Facebook. Thanks:)