This actually happened a while ago (I think on the 4th or 5th of February), but I've been unusually capable of writing posts in advance lately (much more so than normal; I'm not sure why), so I had other, older, stuff to show first.
'Karen' flowered for me once before, too, and actually seemed happier about it then: it produced two buds that time, as compared to one bud this time. (It had a second one, but dropped it before it developed very far.) I know it's capable of quite a lot more than one flower at a time, but oh well. We get what we get.
I want to note here that 'Karen' is the only orchid, of any genus or variety, that has bloomed for me at home even once, much less two times. I don't like 'Karen's flower as much as some of my other orchids' flowers (If I were going to get a Dendrobium bloom, I'd much rather it be the "Humphrey Bogart" variety.), but at least 'Karen' gives me some flowers. One flower. So I suppose it has to be my favorite.
I hadn't noticed the yellow in the sepals previously. It's subtle, but nice.