"Was sooooooo sleepy yesterday #TCAs," the singer wrote. The X Factor judge wore her blonde locks down in the photograph, while wearing a white t-shirt and glasses.
This isn't the first makeup-free photo the rocker has posted. Lovato urged fans back in April to dare to bare when she showed off her natural beauty. "Ladies, be brave today," she tweeted. "Take off your make-up and stop using those filters!! WE are beautiful!!!"
The latest selfie picture was taken just one day after Lovato and Nick Jonas performed her new single "Made in the U.S.A." together at the 2013 Teen Choice Awards held at the Gibson Amphitheatre in Universal City on Sunday, Aug. 11.