Babies Before Marriage: The New Norm in Hollywood (PHOTOS)
Of course, the concept of having babies before marriage isn't entirely foreign. Just look at Brad Pitt and Angelina Jolie, who over the years have given birth to and adopted enough kids to fill Noah's Arc -- and they still haven't set an official date (that we know of).
Still, the trend has certainly grown into something relatively common and substantial -- enough to suggest that certain social norms and traditions may ultimately be a thing of the past.
Click through the gallery, above, to see a list of celebrities who just gave birth -- or are about to pop -- without putting a ring on it first.