Order By month and year in sql with sum

I have a stored procedure and the select statement is:

SELECT     { fn MONTHNAME(OrderDate) } AS MonthName, YEAR(OrderDate) AS Year, SUM(TotalValue) AS Profits
FROM         [Order]
WHERE     (YEAR(OrderDate) = @year)
GROUP BY { fn MONTHNAME(OrderDate) }, YEAR(OrderDate)

this shows the sum total for every month But I need to order the result by month and year coz my result shown like:

April 2013 
February 2013 
January 2013 
June 2013 
March 2013 
May 2013 

What is the solution in such a case?