Fresh from the Independent Spirit Awards, the Django Unchained actress brought her loved one along to the Mattel Games gift lounge on Saturday in Santa Monica, Calif., where they bonded and talked about fashion.
“They told guests that they are extremely close and borrow each other’s clothes constantly,” an onlooker tells PEOPLE.
Clad in a “stunning” Giambattista Valli Couture graphic print dress, Washington “was giggling and thought it was funny that everyone kept trying to take her photo,” the source says.
Eventually, they add, “Her mom kept telling her to try and save her energy because it was going to be a long weekend. She kept saying, ‘I know, mom. I know.’ ”
– Dahvi Shira