Sorry Monsters, but it seems that S&M singer Rihanna has overtaken Lady Gaga to become the most popular female artist on Facebook. Billboard reports that according to social media statistics site Famecount.com, Rihanna passed Gaga early Thursday morning 14 July, with the Barbados native currently sitting at 40,598,000 Facebook fans compared to Gaga's 40,565,000 fans. However, Lady Gaga's Twitter presence - 11.6 million followers and counting - dwarfs Rihanna's 6.1 million followers on the site. After crossing 40 million Facebook fans on Wednesday, Rihanna posted, "40 mil! 1 LOVE #RihannaNavy." She also acknowledged yesterday's Facebook milestone by retweeting a fan who wrote, "I just read that @rihanna is the most liked female on facebook #yougogirl #winning." The only musical artist who still tops Rihanna on Facebook is her "Love the Way You Lie" collaborator, Eminem, who currently has 43.3 million fans. Rihanna clocks in at No. 6 on this week's Social 50 chart.