Jennifer Garner is a total band geek and she doesn’t care who knows it.

The star of Alias and 13 Going on 30 – who recently became a meme after her ‘sudden realisation’ facial expression at the Oscars – dug out her saxophone and full band uniform (complete with feathered hat and white gloves) to send long-time pal Reese Witherspoon, current star of A Wrinkle in Time, well wishes on her 42nd birthday.

Garner shows off her marching and musical skills in the Instagram video she shared yesterday.


You can watch Garner talk about her experience at band camp on James Corden's show below: