safelocked. it doesn't look like a straw. if anything it looks like one of those peel-and-stick teeth whiteners. i'm also guessing it's something to reflect the light on stage to make the teeth shiny.
^ It's straw. You know the girls are often supplied with water in a bottle with straw sticking out of the bottle cap and covered with plastic. I think she's removing the cover..
Btw, look at Maana's glasses refraction.. :o I wonder how much diopter she has..