Magento Get most popular products in a category

$category = Mage::getModel('catalog/category')->load($categoryId); 

$products = Mage::getResourceModel('reports/product_collection') 

    ->addOrderedQty() //total number of quantities ordered

    ->addAttributeToSelect('*') //get all attributes

    ->setOrder('ordered_qty', 'desc') //most ordered quantity products first

    ->addCategoryFilter($category);