She still within the group, Misollini and Niarchos there. Maybe sometimes they need space. But yeah, we've seen Charlotte alone but not Andrea. but Andrea did arrive alone to meet up his family few months ago..
Andrea did actually accompany Tatiana (see previous pages on this post; he's wearing a white suit, like other male guests); but, I wonder if it was a concious choice on the part of Vogue editorial team to omit him? Weird....