's rep says she's expecting her first child
"in just a few months," and she's certainly got the pregnancy glow.
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.
Married in 2010
, Blunt, 30, and her husband, former Office
star John Krasinski
, 33, announced their happy news
"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."