It was Aphex's wife on stage with him (confirmed by weirdcore)

Confirmed in the comments for those who were curious. Talk about a power couple.

https://www.instagram.com/p/Bp1za44BWNe/?utm_source=ig_share_sheet&igshid=19v3a20ie5gyl

stalker alert 

That is so cool, if Weirdcore is not trolling of course