Justin Bieber relayed a message to all his haters via Instagram on Monday, poking fun at those who say he "is losing it."

The 19-year-old posted two photos of himself shirtless, taken in front of a mirror. The images perhaps were taken in his gym, since a treadmill is seen in the background, and viewers see the singer wearing yellow boxers, blue pants and nothing more.

Bieber sarcastically addressed reports of him loving to go shirtless by captioning one image, " 'Uh oh @justinbieber is losing it taking shirtless pics in the mirror' - funny people."

In the second caption he mocked publication headlines: " 'Breaking news worldwide @justinbieber just posted 2 shirtless pictures he must be going crazy' - funny people #forthefansanyways #dontbecreepin."

Bieber continues to post shirtless pictures of himself on both his Instagram and Twitter accounts, and the habit prompted a response from actress Olivia Wilde. On March 1 she tweeted a message to the Nothing Like Us singer, asking him to put on a shirt or go buy one.

"Bieber, put your f---ing shirt on. (unless you lost all your shirts in a fire in which case my condolences and please purchase a new shirt.)," she wrote.

Following his brief hospital stay in March, Bieber posted a Twitter photo of himself shirtless lying in a hospital bed, reassuring his fans that he was doing better after reportedly passing out on stage during a London concert. On March 23 Bieber tweeted a picture of himself with his jacket open and nothing underneath, revealing his full chest. He was also spotted walking through Polish airport security without a shirt.

The pop singer is currently on his Believe world tour, traveling four continents and more than 70 cities in 2013 alone and more shows expected to be scheduled.

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