There are a few of them.
1. 5 Factor Diet has celebs all over its site. You eat 5 small meals a day, with 5 ingredients, workout for 25 minutes, and in 5 weeks see top results.
http://www.5factordiet.com/publicsite/funnel/index.aspx?promo=ECD5D405-5C2D-4E17-8667-96ABE9A82BFB&variable=0&np=1&cid=celebrity%20diets|1442184225
http://www.5factordiet.com/publicsite/funnel/howitworks.aspx
2. Second is The Cookie Diet. You eat 6 cookies a day and dinner. Also popular recently with celebs and cookie lovers
http://www.miamiherald.com/358/story/547675.html
3. Another one is the Caveman Diet. Fruit, berries or vegetables, lean meat, unsalted fish, canned tomatoes, lemon or lime juice, spices and coffee or tea without milk or sugar, for three weeks.
http://www.telegraph.co.uk/news/uknews/1938069/Eat-like-a-caveman-for-a-healthy-heart.html
http://www.medicalnewstoday.com/articles/106988.php
Here is a link to the top 10 Fad Diets :
http://www.associatedcontent.com/article/510669/top_10_fad_diets_for_weight_loss.html?cat=51
It is kind of fun in a freak show way to see what everyone is doing to race to slim ;)