Antonio Brown doesn't seem to be sweating his arrest warrant ... the former NFL superstar just posted a video of him grinning ear to ear while on a bike ride.
The ex-Steelers wideout shared the footage on his Instagram page Friday afternoon ... appearing to show he's not worried about the felony charge he's now facing in Florida.
Launch Gallery Launch Gallery GettyBrown can be seen in the clip pedaling a two-wheeler, all with a huge smile on his face.
It's unclear where he is -- though it seems to be somewhere in the Middle East.