げさな(おおげさな) To exaggerate in your attitude, without actually bending the facts. For instance, you get a little scratch but act like you need to go to the hospital. 大げさalso means, ‘to talk in a grandiose, pompous way.’   $$$
する(こちょうする) Exaggerate in a fairly literal way:You saw one celebrity, but claim that you saw 6.