Justin Bieber's behavior is raising eyebrows yet again.

"So, crazy news guys! There is video on Instagram," the 19-year-old Baby singer, clad in a black baseball cap and showing off his tattoos, says in the clip.

The speed-racing pop star, in the 15-second video, is quite giggly and glassy-eyed, prompting some Tweeters to speculate he might have indulged in marijuana prior to filming.

Watch the video on Breaking Celebrity News