Her latest premiere look? The classic but casual combination - jeans and a jumper.
Before concluding that Katie has given up on making an effort for the red carpet entirely, it's worth knowing the 35-year-old was at the premiere for a comic-inspired action show Marvel Universe Live in New York.
And when watching "Iron Man, Hawkeye, and Captain Marvel hopping around and beating up some evildoers who are amped up on superpower juice," as one reviewer puts it, a floor-length gown isn't really necessary.
Still, Katie's laid-back approach paid off and she didn't forget about her beauty routine.
Simple yes, but sometimes a fuss-free outfit is the perfect way to wow. Who needs expensive diamonds when you've got a glowing complexion and a good pair of jeans?
LOVE KATIE'S STYLE? She's come a long way since her Dawson's Creek days...