Justin Bieber has new ink—but why did he get an "X" on his left arm?

The Canadian pop star was spotted recently with another new tattoo as he was leaving a Cirque du Soleil show in London Monday night. On his left arm, he also has a tattoo of an owl and three others he added in January, including Roman numerals of his mother's birth year on his collarbone, a Native American wearing a headdress on his upper left shoulder, and an elaborate rose on his leg.

In what has been a wacky week for Bieber, he was also spotted in London yesterday trying to avoid detection by wearing a gas mask.

Justin's either really picked up a harcore pot addiction or he's into doing whatever he can to keep a relatively normal life away from the cameras that follow his every move. In other news, the 18-year-old may be picking up a space helmet soon, as well.

NASA has reportedly offered Bieber a chance to achieve his goal of singing in space. The Canadian singer's tweet, "I wanna do a concert in space," was apparently picked up by the NASA team and they are interested in taking up Bieber on his request.

"Maybe we can help you with that. 'All Around the World,' next off it?" was the reply from the official Twitter account of the National Aeronautics and Space Administration.

Talk about a breath-taking performance. 

Bieber may also be moving on to a new gal. He is rumored to be romantically linked to an aspiring British singer, Ella-Paige Roberts Clarke. The Mirror reportedly claimed the 'Boyfriend' singer was trying to impress his new brunette friend, taking her out to a date in his Rolls Royce and then to Justin Timberlake's concert at the Forum, where the two looked like an item.

What do you think of Justin's new tattoo? What do you think it stands for? Is he starting to go a little overboard with all of the new ink or do you like tattoos? Let us know how you feel!