Angelina Jolie combined her love for kids and gigantic stuffed animals, when she helped Tim Alexander and his twins, Allen and Brandon, in Toluca Lake, CA trying to sell "Big Bear" ... an 8 1/2 foot tall teddy bear for $50.
After an hour of nothing, their father Tim says a Cadillac pulled up with Angelina and Shiloh inside, and BOOM ... they had a taker. He says Angelina doubled the twins' asking price -- handing over $50 to each of them.
Dad says Allen and Brandon had no idea Angelina was a celeb.