JAY-Z JOINS RIHANNA ONSTAGE IN LONDON: Duo performs 'Run This Town' and 'Umbrella' at Brixton Academy; plus, rapper cancels remaining 2009 tour dates.

       The singer and her mentor performed "Run This Town" and "Umbrella" at London's Brixton Academy, a show streamed live online by Nokia. RiRi also sang new tracks "Mad House," "Wait Your Turn" and lead single "Russian Roulette," currently No. 9 on Billboard's Hot 100, before being joined by Young Jeezy on another album track, "Hard."      

       The R&B star – sporting at studded leotard and backed by a full rock band – also gave the audience such previous hits as "Don't Stop the Music," "Take a Bow," "Disturbia" and "Live Your Life."      

       Nokia streamed the event around the world at www.nokia.com/rihanna and will also offer an exclusive version of "Rated R" via its Nokia Music Store, reports Billboard.

       Jay-Z, meanwhile, has cancelled the remainder of his 2009 tour dates and added extra shows in 2010 in support of his latest studio set, "The Blueprint 3."       

       Upcoming shows in Lubbock, TX (11/17); Albuquerque, NM (11/19) and El Paso, TX (11/20), have all been canceled due to an "unforeseen scheduling conflict," according to concert promoter Live Nation. Refunds for the shows will be made available immediately at the point of purchase.      

       He earlier moved a Nov. 22 show in Austin, TX, up to Nov. 10 in order to make a live appearance at the 2009 American Music Awards, which is scheduled to take place in Los Angeles on the same day as the original Austin date.      

       The early 2010 leg of the performer's "BP3" tour continues to gather steam, however, with a handful of fresh dates recently added to an already full-sized schedule. The tour is currently set to kick off Feb. 20 in Sunrise, FL, and will hit 17 cities through late March. Dates are below.

February 2010
20 - Sunrise, FL - BankAtlantic Center
22 - Houston, TX - Toyota Center
23 - Dallas, TX - American Airlines Center
25 - New Orleans, LA - New Orleans Arena
27 - Atlanta, GA - Philips Arena
28 - Greensboro, NC - Greensboro Coliseum Complex

March 2010
3 - Washington, DC - Verizon Center
6 - East Rutherford, NJ - Izod Center
7 - Norfolk, VA - Scope Arena
11 - Boston, MA - TD Banknorth Garden
14 - Auburn Hills, MI - Palace of Auburn Hills
16 - Pittsburgh, PA - Mellon Arena
19 - St. Louis, MO - Scottrade Center
20 - Indianapolis, IN - Conseco Fieldhouse
22 - Denver, CO - Pepsi Center
24 - San Jose, CA - HP Pavilion
26 - Los Angeles, CA - Staples Center