They will not stop doing this, and the more you mention their names, the more they will continue. Please, really stop. Both of them (all of them? They are really all the same personality at base) are uncreative attention-seekers. Please, listen to what people are saying and stop encouraging them. Even negative attention will do so, because they evidently didn't get enough recognition from their mothers when they were younger (or something).

Just ignore them and, if they are even somewhat bright, they will very soon realise that they are wasting their youths.