Justin Bieber kissed a mannequin's head while appearing on a TV show.

The Canadian singer was a guest on Late Night with Jimmy Fallon, where he was challenged to take part in a game with the talk show host last night.

A number of Justin's favourite things had been gathered on a table, such as a cup of coffee, some noodles, one of his dolls and the head which sported a baseball hat. The 18-year-old star was asked to take each item and throw it through a basketball net.

When it came to the mannequin, Justin couldn't control his emotions. He gently removed the hat and began caressing the face and dark hair, before gently planting a kiss on the plastic lips as the crowd whooped and cheered.

"Don’t fall in love with it, Justin, no! Focus!" Jimmy yelled as the smooch continued. "Focus! Focus!"

Also on the table was a framed picture of action hero Chuck Norris. Justin was thrilled when he spotted the image and immediately began playing along with the joke.

"My dad... you don't know that was my dad? This is breaking news! Chuck Norris is my father everybody," he giggled.

The young star also spoke about his upcoming stint as a host on US sketch show Saturday Night Live. He will take the reins this weekend and is already anxious about the appearance.

"I’m nervous, but I think it’s going to be fun," he said. "I’ve just got to remember to memorise the lines."

The star also opened up about his well-documented love of cars. Justin has experienced problems with the police due to his fast driving, but insists the run-ins aren’t really his fault.

"You know what, the police really like to pull me over. I don’t do anything, I promise. It looks bad, you see pictures of me, but really, the tints are really dark and a lot of the times they’ll pull me over," he claimed.

“I don’t want to cause accidents, because people are trying to take pictures and I thought it would be more safe for everyone else if I had dark tints. I’m having fun being 18 and enjoying my life and being responsible.”

Justin has experienced a difficult time lately.

He is understood to have split from his girlfriend Selena Gomez, has been accused of smoking marijuana and reportedly engaged in a romp with a nursing student.

His loved ones are believed to be concerned about his behaviour.

"Nobody’s going to name names or point fingers, but Justin knows who he shouldn’t be hanging out with and has clearly been caught in some undesirable situations because of these people," an insider told RadarOnline.