Washington, Feb 16: Brad Pitt and Angelina Jolie were accompanied by their 4-year-old twins Vivienne and Knox, as the family headed to Natural History Museum in downtown Los Angeles on Valentine's Day.
A witness told Us magazine that with a bodyguard in tow, the family members arrived at the museum -parking in the standard parking lot and with no special VIP treatment - and went straight to the dinosaur hall, Us magazine reported.
The 37-year-old actress held hands with Vivienne, while Pitt held onto to Knox.
An observer said that Pitt was walking around reading to Knox and explaining things to him.
The family paid particular attention to the "hands-on stuff" at the discovery centre, where the twins played with fossils and inspected items with microscopes.
The witness said that Vivienne loved the butterflies and Knox was interested in the dinosaurs and giant spiders, adding, that the couple stood back at one point and let the kids play.
"They were smiling and really enjoying the day-you can tell they love watching their kids learn," the witness said.
Engaged since last spring, Pitt and Jolie reportedly had a more grown-up date later that night with dinner at the Roosevelt Hotel. (ANI)