Gradient?s parameters:

Create Valentine?s Day Wallpaper in Photoshop CS

Blending Options-Stroke

Create Valentine?s Day Wallpaper in Photoshop CS

Take the following tool to draw a flare of white color, applying these conditions: on the layers we should have 9% Fill
and Opacity of 63%.
Then mark out the layer with the heart on it and click with the mouse on the following option:

Create Valentine?s Day Wallpaper in Photoshop CS

The effects will be applied in the limits of the heart?s contours.

Create Valentine?s Day Wallpaper in Photoshop CS

Create Valentine?s Day Wallpaper in Photoshop CS