Yes, if you buy this post right here, (which I do, and I’m also going to rebagel it bc why haven’t I yet? Maybe it’s buried in the queue…), in which @gojiro informs us that:

“…mirrors used to be backed with a reflective layer of silver — which, as the metal of purity, would not ‘interact’ with Vampires, who are the Devil’s work. However, modern mirrors have used aluminum as their reflective backing for many years now — and aluminum is not a ‘picky’ metal at all…”

So yes you may headcanon Armand as winning the Ugly Sweater Contest by standing in front of Lestat w/ a mirror as shown above by @superhiki!

…but I also really like the “hair dying parties with other vampires cause they can’t see what they’re doing in the mirror.” which still works for the vampires of What We Do in the Shadows, who live in the modern era, and can’t see their reflection in mirrors (but they can see it in photographs, IDK I JUST REALLY LIKE THE DYE PARTY IDEA so as Tim Gunn would say, “Make it work.”)