Beyonce posted a number of pictures on her official website, including this candid shot.

This image appears in the gallery:
34 Pictures You Might Have Missed (19th May 2014)

1. 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
9. 

10. 34 images

See the full gallery: 34 Pictures You Might Have Missed (19th May 2014)