WATCH: Did Millie Bobby Brown Just Reveal Gaten Matarazzo's Girlfriend Has Joined 'Stranger Things'?

14 August 2018, 14:50 | Updated: 14 August 2018, 14:56

Millie Bobby Brown took to Instagram to 'welcome' actress Lizzy Yu, captioning the post 'I approve' leading many to think that there is a new addition tot he Stranger Things series 3 family.

Stranger Things' Millie Bobby Brown has everyone shook with her latest Instagram, by posting a video saying 'welcome to the family' to fellow cast mate Gaten Matarazzo's girlfriend, Lizzy Yu, leading people to believe she is the newest cast member for season 3 of the show.

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The cast are currently filming in Jackson, Georgia, and in the clip Millie rides in a car with Gaten and Lizzy, and screams with excitement, with the caption 'I approve', so Millie's either super excited Lizzy's come to visit them on set- or there's a new kid on the block.

Together again♥️

A post shared by Lizzy Yu (@lizz.yu) on Jul 2, 2018 at 7:22am PDT

The show is no stranger (excuse the pun) to casting younger actors that know one another- with Gaten, Sadie Sink and Caleb McLaughlin knowing each other from when they were on Broadway before they starred in the show, so it isn't beyond the realm of possibility that Lizzy, also a stage actor, could now be in the show as well.

Not only did I have a blast at my schools Semi Formal dance yesterday, but it’s also best friends day so I thought I’d post these pics of me with my best friends ever. Love these guys more than life.

A post shared by Gaten Matarazzo (@gatenm123) on Jun 9, 2018 at 10:17am PDT