Aleph's getting so big!

A dressed-down Natalie Portman got in some mommy time with her adorable three-year-old son Aleph. Wearing a sweatshirt and baggy jeans, the Oscar winner picked up the tiny tyke, who was wearing a Spiderman shirt, after a playdate with a friend.

This is definitely not the way we usually see the glamorous star. Recently, the doe-eyed brunette has appeared in the brand new advertising campaign for Miss Dior, the high-end perfume that she has been the face of for several years.

Last week, the 33-year-old struck a dashing pose on the red carpet while attending the 65th Berlin Film Festival to promote her new movie Knight Of Cups.