Anderson Silva vs. Stephan Bonnar main event for UFC 153 in Rio, Brazil

UFC middleweight champion Anderson Silva will be gaining some weight as he climbs up to the 205-pound division to battle Stephan Bonnar in the main event of UFC 153 on Sat., Oct. 13, 2012 in Rio de Janeiro, Brazil.

USA Today brought word of the news just moments ago, shocking the MMA world.

The event takes place inside the HSBC Arena.

The new addition was necessitated when original headliner, featherweight champ Jose Aldo was sidelined due to injury.