Kristen Stewart Smiles All the Time: The Video Proof

Of course Kristen Stewart smiles.

Though she has grown a reputation for having a seemingly permanent sourpuss pout, the "Twilight" star has a history of flashing her pearly whites.

And we have the evidence. Watch our supercut of K-Stew beaming through the years - on film and during candid moments.

It confirms what the "American Ultra" actress defended during a recent appearance on the "Tonight Show Starring Jimmy Fallon." “I smile a lot, I swear," she told Fallon. "It’s weird that that notion is so perpetuated.”

For the record, she added that there will be no shortage of smiles from her in "American Ultra," which hits theaters on Friday. “It’s a fully-formed comedy,” she said. Watch the "American Ultra trailer below.