What is happening in this Britney Spears video?!

"It's Britney Witch."

Nick Grimshaw, who they call Grimmy across the pond, is a British television and radio personality, who apparently brought out the spookiest/silliest in Britney Spear with this...sketch? Bit?

Honestly, I don't really know what this is, I just like the ridiculous faces that BritBrit makes.