The actress, 32, who is expecting her first child with fiancé Dax Shepard, is seen resting in bed with her shirt pulled up above her pregnant belly.
“Some people are more excited than others about the baby filling,” she captioned the photo.
The House of Lies star tweeted another photo of her other dog taking a nap on her pregnancy pillow. “The thief absconded with my body pillow . . . then proceeded to act as though nothing was wrong,” she wrote.
Without missing a beat, Bell said, “If anybody wants it, let us know!”
The wisecracking duo expect their first child this spring.