March 27, 2013 | Celeb Watch

Justin Bieber shirtless ... at the airport!

What is up with Justin Bieber? The young pop star is becoming better known for his antics than his music.

His latest shirtless appearance (at right) was late on Monday at - of all places - an airport in Poland. It was 14 degrees outside, but he stripped off his shirt as his car approaches the departures drop-off. Then he proceeded, topless and pants half down, to airport security. 

On Tuesday he arrived home in greater LA in time to have an altercation with a neighbor. Police had to stop by the singer's house in Calabasas after the neighbor claimed Beiber said he would "fucking kill him" and spat in his face when he confronted Biebs about racing his brand new Ferrari around the neighborhood. 

This isn't the only odd behavior the star has been exhibiting. He tried to physically bring down an annoying paparazzo, and had to be restrained by his own people. He recently showed up two hours late for a London concert (on a school night!). He was seen wearing a gas mask on a night out. And - this is the part I'm not complaining about - he often appears  shirtless in unlikely places.  

Of course, these are all part of growing up as a celebrity, but it can be a slippery slope. Just ask Britney, or Lindsay, or Amanda. I'm taking bets on when Biebs whips out his bad boy dick. 

Justin Bieber flies back to Los Angeles and into more trouble [Reuters]