Answer: The plural of cameo is (3.) both "cameos" and "cameoes".
Explanation: The word "cameo" is a noun generally used to refer to a brief part in a film, a TV show or a play performed by a well-known star. <u>The plural of "cameo" is both "cameo" and "cameoes"</u>. In other words, both forms, "cameo" and "cameoes", are accepted when someone needs to refer to more than one "cameo". However, <u>people tend to use more "cameos" than "cameoes", which is still in occasional use but it is now considered to be dated and unfashionable</u>.