Just in time for the weekend, here's part two of One Direction's behind-the-scenes special, 'Access 1D: USA'! Catch a glimpse of what life was like for the guys on the road as they toured across America — watch Harry pull pranks backstage, Zayn interact with fans, Niall play the guitar shirtless, Liam sing on the floor, and Louis show his American pride!

Plus, look for an adorable cameo by Katy Perry congratulating Niall on his success (It was Katy's deciding vote that put Niall through on 'The X Factor')!

Watch part two of 'Access 1D: USA' below:

https://www.youtube.com/watch?v=rltt8yawXP4

And in case you missed it, you can watch part one of Access 1D: USA HERE.

What's your favorite moment of part two of the 'Access 1D: USA' video?