Brooklyn Decker showed off her ever-growing baby bump in a recent Instagram photo on Monday while supporting the cancer support group, Pimpin Joy.

"The tot and I #pimpinjoy!!!" she caption the mirror selfie, wearing a plaid button shirt and a red, white and blue ball cap.

 The tot and I #pimpinjoy !!! @radioamy @mrbobbybones

A photo posted by Brooklyn Decker (@brooklyndecker) on Jun 29, 2015 at 4:42pm PDT

Decker announced her pregnancy with 32-year-old husband Andy Roddick in another Instagram post in May. "So this happened... #the3ofus," she wrote as she held her stomach.

"I'm happy to confirm Brooklyn and Andy are expecting a new addition to their family in the autumn this year," the 28-year-old actress' rep confirmed at the time.

 So this happened... #the3ofus

A photo posted by Brooklyn Decker (@brooklyndecker) on May 2, 2015 at 1:50pm PDT

The expectant parents married in 2009. This will be their first child together.

"Getting congratulated for boning is super exciting," she joked in an interview with People in May. "It's strange because you finally admit to your father, 'Dad, I do it.'"

A woman named Amy, who is a radio personality for The Bobby Bones Show out of Austin, Texas, started the Pimpin Joy campaign. It is dedicated to her mother who has battled cancer for years, but always tries to stay positive.

Amy tattooed the word "joy" on both her wrists, and she encourages others to spread joy and share it with her and The Bobby Bones Show on social media.