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Knox Jolie-Pitt, Vivienne Jolie-Pitt

FameFlynet Pictures

Brad Pitt and Angelina Jolie shared a love of learning with their kids on Valentine's Day.

The ever-engaged couple brought twins Knox and Vivienne to Los Angeles' Natural History Museum, where the favored attraction for the 4-year-olds turned out to be—no surprise here—the dinosaurs!

"Brad at one point was overheard telling a staff member they wanted to come see the new Dinosaur Hall, and they definitely saw a 'Dinosaur Encounter' show," which features a life-sized Tyrannosaurus rex puppet, a source tells E! News.

The insider says the family didn't give off any needing-special-treatment vibes and just seemed like "the coolest people."

We hear that Knox and Vivienne had a blast playing with fossils, looking at teeny-tiny specimens through microscopes and putting together a T. rex puzzle in the Dinosaur Hall's discovery center.

Sounds like Brad and Angie had a Valentine's Day for the ages.

—Reporting by Sharareh Drury