Create a new file that would have 217x450px, 300 dpi, then take the indicated tool and create the background for the picture to be.

Create Valentine Day Background in Photoshop CS

Fill 0 % on the layers.
Blending Options-Gradient Overlay

Create Valentine Day Background in Photoshop CS

Gradient?s parameters:

Create Valentine Day Background in Photoshop CS

Take
now this instrument and represent an ellipse of white color.

Create Valentine Day Background in Photoshop CS

Copy the new made layer and make use of Free Transform option to increase the copy and place it the right way, indicated in the picture below.

Create Valentine Day Background in Photoshop CS