Angelina Jolie is just like us! NOT!

The down-to-earth star -- a UNHCR ambassador who just returned from a trip to Bangladesh where she visited Rohingya refugees from Myanmar -- took her 15-year-old son Pax shopping on Rodeo Drive in Beverly Hills on Saturday and bought him a $900 YSL sweatshirt!

She's allowed to indulge, of course --she's super rich and what's one more hype beast rich kid teenager in LA -- they're a dime a dozen here.

Jolie wore a $3000 Dior trench coat for the shopping trip which started at the more practical Urban Outfitters and ended up in LA's Golden Triangle where the most expensive boutiques in the city reside. And clearly Pax is no stranger to luxe labels -- he was already sporting a Givenchy sweatshirt which retails for $600 ... a bargain compared to the Saint Laurent!

So what's all the hype about a bunch of cotton with a logo on it? Ask Pax!