OSI Restaurant Partners Inc. (NYSE: OSI) shareholders have approved a $41.15 per share buyout offer from Bain Capital Partners and Catterton Partners. The deal is valued at around $3.2 billion, and is expected to close later this month. OSI is a restaurant operator whose brands include Outback Steakhouse, Cheeseburger in Paradise, Roy's and Carrabba's Italian Grill.