Stacy Keibler celebrated Mother's Day with this image. Credit: courtesy of Stacy Keibler

Happy Mother's Day to soon-to-be-mom Stacy Keibler

The pregnant star, 34, celebrated a very significant Mother's Day on Sunday, May 11, in anticipation of the birth of her first child, due this summer.

Keibler posted a sunny shot to her Instagram in recognition of the holiday, showing her bare baby bump. In the image, George Clooney's ex-girlfriend cradles her tummy, with her massive engagement ring sparkling on her left hand. She wears an Anna Kosturova crochet crop top over a white bikini and shields herself from the sun with a fedora and a pair of aviator sunglasses. 

"Can't wait to spend next #MothersDay with this little angel in my arms #happymama #babybump" she captioned the photo. Keibler is expecting a daughter with husband Jared Pobre, whom she wed in Mexico on March 8. 

When she wasn't sunning her growing belly this weekend, Keibler spent time with her family. The former Dancing with the Stars contestant put up another photo, this time in a sundress, with the women in her life.

"Spending my first #MothersDay with my #Mommas," she wrote. "#desertliving #happy #family #Poblers."