French female singer. UNKNOWN SONG LA LA LA LALALA LA LA LA LA

Hey guys, On the radio yesterday or RTL2 and a french song came up, I cannot speak french and did not remember any specific words but it had "LA LA LA LALALA LA LA LA LA: it didnt sound like a old song, it sounded quite modern. And I am pretty sure I had heard it before.

Any help would be good <3
thank you

Maybe a cover of "Bubble Star" by Laurent Voulzy (1978)

How was the tempo? Was it fast, slow, moderate?

Here's a guess.

Mireille Mathieu - Tous Les Enfants Chante Avec Moi https://www.youtube.com/watch?v=UtY-hRdfjlY

At the 1 minute mark is when the constant LA LA LA'S start.