During an interview on the April 4th, 2007 episode of Late Night with Conan O' Brien, actor B. J. Novak said that he buys Cadbury Creme Eggs every year, and took issue with Cadbury's claim that the eggs were not getting smaller ("They're Not Getting Smaller, You've Gotten Bigger!"), The Cadbury Schweppes Creme Egg Fact Sheet has a FAQ section with the question, "Why has the size of the egg changed?" and the answer, "It hasn't - you've just grown up!" However, this statement has been on Cadbury's UK-based website since at least October 23, 2003[1] - long before the smaller 2007 egg was released. However, the UK-based site of Cadbury's global operation does not necessarily apply to Cadbury products purchased in the United States. They are made by Hershey's under license. The Cadbury Creme Egg in the UK, Canada and Australia remains unchanged and the website FAQ valid. The American Cadbury website makes no claims about the size of the egg nor the size of the eater.
The interview on Conan O'Brien does not mention this, but does go on to show Novak with an unopened Cadbury Creme Egg from 2006, which he'd brought with him to the interview. The camera zoomed in on the two eggs for comparison purposes, and a visible size difference was revealed, with the 2006 egg being noticeably larger.
And yes they do look smaller. 
