Aubrey O'Day shows off her one "ab" via Instagram Thursday, August 1. Credit: courtesy of Aubrey O'Day

Aubrey O'Day is flaunting her assets. The 29-year-old singer proudly showed off her toned body via Instagram Thursday, August 1, revealing her workout progress.

"Sprouting my first ab…so f-king excited ;)!" she wrote. Dressed in a matching black sports bra and short shorts, the blonde vixen posed for a selfie also sporting a green hat that covered her face and kept her hair swept up tightly underneath.

The former Celebrity Apprentice star and Danity Kane singer rarely shies away from the camera, often posting a variety of bikini-ready shots on her official account. O'Day also has shared photos getting ready to work out. 

"Been hitting @barrysbootcamp HARD all week! They r the best!" she wrote early June. "Hiking the hills with my lil man!" she wrote via Twitter a week later, while posing with her dog.

Though the new photoS could hint at O'Day getting prepped for a Danity Kane reunion, it's doubtful. O'Day and the rest of the "Damaged" singer's -- Shannon Bex, Dawn Richard, D. Woods, and Aundrea Fimbres -- shut down those rumors while grabbing a bite to eat without their former manager, Diddy, in May 2013.