10/14/2013 AT 11:55 AM ET
The actress, who is currently filming Into the Woods with Meryl Streep, flashed a big smile, keeping it comfy (and her baby bump under wraps!) in gray jeans and sneakers, a striped tee and a cozy sweater as she arrived at London’s Heathrow Airport on Saturday.
“Meeting John really changed my life,” Blunt told InStyle in April. “When I feel the support I have from him, I feel invincible. There’s someone behind you on your good days, and someone in front of you on your bad days.”