Lady Gaga has been surpassed in terms of views on Google's YouTube video site, as Rihanna passed her to become the female muscial artist with the most views all-time.  Gaga became the first musician to log 1 billion views back in October, but Rihanna has surged since then, hitting 2.068 billion views over the weekend.  Both women trail Justin Bieber as the world's most viewed artist on YouTube, as the teen sensation is over 2.2 billion views.