Online music video portal Vevo has launched its app for iPhone and iPod touch this morning (App Store link). The free app lets users find and watch videos, and create their own video playlists.The app promises access to Vevo’s entire catalogue, which currently stands at 20,000 videos from more than 7,000 artists. It will also offer video premieres, charts, and original programming from Vevo’s site, through its various branding deals.The Vevo iPhone app includes sharing features to tell friends about videos via Twitter, Facebook and email, and there are tap-through links to buy music from Apple’s iTunes Store. The app also ties into iPhone’s GPS feature, by letting users see what videos are being watched around their current location.Vevo promises “many new & exciting updates” to follow in the weeks ahead, but warns that users should make sure they’re on a Wi-Fi network for “highest quality videos”. The app is currently only available in the US, and we’re in the UK, so we can’t see how advertising fits in.Update: Vevo has just issued its press release on the launch, and it seems the app is free thanks to an exclusive partnership with AT&T Wireless – presumably it will get branding space within the app.From its screenshots on the App Store, we can see that users can’t yet comment on videos from within the app: they’re asked to visit Vevo.com to do that. The Vevo app’s debut follows MySpace’s launch last week of Music Romeo, a music videos app for Apple’s iPad.