Justin Bieber wipes out while skateboarding

"My pants keep falling down!"

That was the line uttered by Justin Bieber as he tried to do a skateboarding stunt over two sets of stairs in New York. He had to keep pulling up his black pants over his tunic top.

And when he didn't succeed at first, he tried tried again. At one point he took a tumble right, going headlong over the skateboard and tumbling on the concrete. But he popped right back up.

Of course the Biebs drew a crowd and fans had their phones going to capture all his classic moves.

The pop star was in the Big Apple with Hailey Baldwin (Stephen Baldwin's daughter) and Alfredo Flores.

Here's a closer shot, in which a female voice can be heard saying, "I love him so much."

He ended by skating off into traffic.

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