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Ashley Parker Angel Joins Bare-Butt Pop Parade With Nude Instagram Pic

Joan Marcus
Ashley Parker Angel in the touring production of "Wicked."

Singer/actor Ashley Parker Angel celebrated the completion of his 100 Days of Fitness challenge with a naked photo on Instagram. The former O-Town member joins other recent butt-baring male music stars on social media like Justin Bieber, John Legend and Cody Simpson.

"The #100DaysOfFitness challenge may be behind me now but the journey continues," Parker captioned his Instagram photo. "It's incredible how the human body responds and transforms to even just 100 days of a consistent diet and exercise program."

Parker -- who is currently on tour with the musical Wicked as Fiyero -- closed his photo's comments with a note of encouragement, writing "…you will look back at where you started and be astounded at how far you've come... and you might just be inspired enough to post a naked picture of yourself on Instagram." 

As a member of O-Town, Angel notched a pair of top 10 singles on the Billboard Hot 100: "Liquid Dreams" and their highest charting effort, the No. 3-peaking "All Or Nothing." As a soloist, Angel earned a No. 5 hit album on the Billboard 200 chart with his solo debut Soundtrack To Your Life.

Angel hasn't been one to shy away from sharing revealing images of himself via Instagram. He has been regularly posting saucy snaps for more than a year. Below are some safe-for-work highlights from his ever-growing collection: