Or you can take feat from Races of Destiny which is known as City Slicker. It gives bunch of class skills; disguise, forgery, gather info and K:local. I often had asked other GM's allow use basis of that feat to get four class skills.
So example you could say create feat called 'Noble Born' which means your char borned as noble and so has some extra class skills as he was born noble. You would then have Bluff, Diplomacy, K:Nobility&Royalty, Perform as class skills (nobles need able to be diplomatic, sometimes able to lie to be polite or hide truth, know other nobles and perform for able dance or artistic hobby).