Duplicate Row Excluding Primary Key

I am trying to duplicate a row in a table and this is the solution I came up with:

CREATE PROC duplicate_row(@my_primary_key)
AS

DECLARE @sql_stmt varchar(MAX)
SET @sql_stmt = 'INSERT INTO My_Table('

SELECT@sql_stmt = @sql_stmt + COLUMN_NAME + ','
FROMINFORMATION_SCHEMA.COLUMNS
WHERETABLE_NAME = 'My_Table'
ANDCOLUMN_NAME NOT IN ('my_primary_key','title')

SET @sql_stmt = @sql_stmt + 'title) SELECT '

SELECT@sql_stmt = @sql_stmt + COLUMN_NAME + ','
FROMINFORMATION_SCHEMA.COLUMNS
WHERETABLE_NAME = 'My_Table'
ANDCOLUMN_NAME NOT IN ('my_primary_key','title')

SET @sql_stmt = @sql_stmt +' title+''_copy'' AS title FROM My_Table WHERE my_primary_key = '+LTRIM(STR(@my_primary_key))

EXEC(@sql_stmt)

However this stored proc is horrifically slow. I was wondering if anyone had any suggestions on a better way to accomplish this.
-thanks