Britney & Madonna to Sing Again!

Move over JT, Madonna and Britney Spears are collaborating once again!

Entertainment Tonight has confirmed that the two headline-making entertainers taped a performance over the weekend that will be shown at Madonna's Sticky & Sweet tour, which kicks off on August 23 in Cardiff, Wales.

The last time these two shared a stage was at the 2005 MTV Video Music Awards, where the two-some performed alongside Christina Aguilera and shared a controversial onstage liplock!