What's New in Version 1.3
* Quick access to new uploads from subscriptions via "My Subscriptions" feed on the Guide
* Access to Live streams
* Queue up videos to play on TV
* One Channel branding for video creator channels
* Stability and performance improvements
A stock YouTube application had been included on iOS devices since the launch of the original iPhone in 2007, but with the debut of iOS 6 last year that application was discontinued. Google rolled out its own native YouTube app for iOS last September just ahead of the iOS 6 launch and has updated it several times since that debut.
YouTube is a universal app and can be downloaded from the App Store for free. [Direct Link]