'Geostorm' Child Actress Sterling Jerins -- Only 10 But Making It Rain

There's nothing sci-fi about Sterling Jerins' payday in the upcoming Gerard Butler blockbuster "Geostorm" ... it's real, and it's big.

Producers are handing the 10-year-old actress $125K for her role as Hannah in the flick -- she'll also have plenty of privacy off set in her trailer -- one half of a huge WiFi ready "double-banger."

If you don't know her name you will -- the young star best known for roles in the show "Deception" and Brad Pitt's "World War Z" will be getting shared billing with her co-stars.

She's learning the ropes fast.