I,ve always called it bridal wreath Gattina and like it very much(I mentioned on karenfrance's blog that its with a pink ribes that flowers at the same time, I just give them a light trim after flowering.
Your plant is a lovely shape and looks really well

I cut back every branch that has flowered this year. It will flower next year on the new growth it makes this year.
What a beauty that one is. It's a very happy plant!

What a lovely spray of blossoms.

It was unfortunate that the year it flowered this well, I didn't think to cut it back until around late summer/early autumn, and the following spring was a bit of a wash-out flower-wise.

Thats the trouble Gattina, they look so lovely, that you don't want to be too heavy with the pruning, in case you get it wrong.My sister in law had a similar Spirea and I had to chop it back when I first did her garden as it was out of control. It always bloomed well afterwards. As it was my SIL's garden and she just wanted it kept tidy, I didn't worry a lot, but if it was my own, I would be more cautious.

Certainly they do flower on new wood, better than on old, so a judicious removal of the oldest stems would help the shrub flower in the future.

Thank you, everyone. Off to find the secateurs......

You can cut back hard with these at this time of year and still get flowers the following year.

I use an electric hedge trimmer on some of these in my customers' gardens. So long as it is done imediately after flowering you should get good flowers again next year

Snap, Anchorman, hedge trimmer for me too, though you always end up having to tidy by hand afterwards I find. It's still quicker though...