On Tuesday, the actress posted a photo on Instagram that shows her standing sideways in front of a mirror.
“Alright, I couldn’t resist,” she wrote in the caption.
Stiles has not publicly mentioned her pregnancy until now, but has casually showed off her pregnant belly while promoting her miniseries “Riviera.”
In January 2016, the actress announced on Instagram that she and Preston J. Cook, who specializes in camera work for films and TV shows, got engaged. “Best Christmas ever,” she wrote in the caption of a photo of her ring.
This will be the couple’s first child.