Starting today, Youtube is offering VEVO?s library of official music videos from artists like Lady Gaga, Rihanna, Kanye West and U2 onto the YouTube 2.0 app for Android.

Vevo music website is a joint venture between Google, Sony Music Entertainment, Universal Music Group, and Abu Dhabi Media and has deals to feature content from EMI and independent recording labels.

To watch these videos a mobile phone needs to be running Android 2.2 (Froyo). Although the latest YouTube native app comes pre-installed on many Android 2.3 devices (like the Nexus S), users can also install it manually by searching for 'YouTube' in Android Market and downloading the latest version.

Youtube is also launching several new features to make it easier to discover music videos on mobile. Music videos are now clearly marked with a 'music note' badge, artist bio is alilable to users while watching a video, the 'artist tracks' tab offers more tracks from the same artist while the the 'related artists' tab returns similar bands.

Youtube also said that YouTube partner videos will also have pre-roll ads appear on the YouTube 2.0 app for Android. This expands distribution opportunities for Youtube's partners like VEVO, but also opens up more revenue to its partners distributing their content to mobile.

The mobile ad market is growing fast and set to surpass $1 billion in the US in 2011. Youtube claims that the YouTube web site exceeds 200 million views a day on mobile, a 3x increase in 2010.

Youtube also plans to let its partners run ads more broadly across other mobile platforms, beyond Android native apps.