• Justin Bieber uploaded the pic from Iceland.

Justin Bieber uploaded the pic from Iceland. (Photo : Instagram)

Justin Bieber apparently took his advertising campaign too seriously when he decided to take a dip in the ice cold water in nothing but wet, white Calvin Klein underwear in Fjaðrárgljúfur, South Iceland on Sept.22, Tuesday.

The mega star is in Europe for a promotional tour of "What Do You Mean?" when he decided to take the plunge in the glacial river. Going by the pic that the singer uploaded on Instagram, it was an impromptu decision and he just stripped off, then and there, and jumped.

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Despite the low temperature and the chilling water, the "Baby" hit maker seems to be in high spirits in the pic and was apparently so much pumped by his daring feat of taking extra chilly polar plunge that he was not hesitant to share his semi-nude pic on Instagram.

"Glacier dip in #iceland," wrote the singer to caption the pic in which he is seen sporting  tattoos and muscular mid-section, not to mention his nearly see-through undies.

Bieber has reportedly taken Europe by storm by his whirlwind promotional tour, stopping at all the prominent places including Paris, Germany and London. While he seems to be mesmerized by the sheer beauty of continent judging by his constant Instagarm feeds, he also has found some beautiful locations to record music, Daily Mail reported.

Meanwhile, Bieber's collaborator Diplo has claimed that he was a major force in the singer's recent critical success, including "Where R U Now."

"I just listened to his music, advised and made adjustments to new songs," the 36-year-old producer and DJ told Entertainment Weekly at the iHeartRadio festival in Las Vegas this weekend before further adding that he has also helped Bieber "with the overall feel of the sound."