Rihanna rocks the house at the launch party for a telephone brand in London. The 20-year-old Barbados belle previewed songs from her upcoming album, Rated R, including "Mad House," "Wait Your Turn," "Russian Roulette" and "Hard" with special guest Young Jeezy.

She also played her past hits, including "Disturbia," "Take A Bow," and "Live Your Life" mixed with "Run This Town," when Jay-Z came out and the crowd went wild.