Yep, looks like their admins are having some good time celebrating V-Day rather than fixing servers Stats are frozen since early morning. You can clearly see it by comparing impression counts in AdSense and in Analytics if you have it installed.
I haven't checked mine. Are they down or just frozen? I've never heard of them freezing before. Try checking Matt Cutts' blog, he may have an explanation.
Stats are being updated, and except for impressions seem to have mostly caught up. Google made a few comments about this on their blog. https://www.blogger.com/comment.g?blogID=5576995&postID=1785888370130073797&isPopup=true
Impressions are down but clicks are slightly above normal. Suspect something wrong only with the impression count.