Britney Spears' young sons make adorable cameos in mum's new video for her The Smurfs 2 tune Ooh La La.

In the promo, Sean and Jayden are featured watching the live-action sequel at the cinema with their mum when she gets zapped into the movie and performs her new track surrounded by little blue people.

Britney's boys even get speaking roles - Jayden says "Cool" as mum appears on the big screen, and his brother waves and offers up a "Hi mum" as the song begins.

The camera cuts back to the siblings as they enjoy scenes from the new movie, while munching on popcorn.