That timing when she calls Alex - Christine just as the music cuts out and that cheeky turn and grin at the camera is one of the many reasons why Barry Humphries is a comic genius.
IMO, there has never or ever will be again, be a comedian so funny as Dame Edna! Had me laughing for most of my life! They don't make them like this any more!
It's not just that. it's also because people were saying Alex was copying Christine Bleakley and there wasn't much difference between them. Barry Humphries is playing on that.