What do the Clique series' titles parody?

Question: What do the Clique series' titles parody!?

I know that Bratfest at Tiffany's is a play on Breakfast and Tiffany's but what about the others!?

- Best Friends for Never = Best Friends for Ever
- Revenge of the Wannabes = !?!?
- Invasion of the Boy Snatchers = !?!?
- The Pretty Committee Strikes Back = !?!?
- Dial L for Loser = !?!?
- It's Not Easy Being Mean = !?!?
- Sealed With a Diss = !?!?
- P!.S!. I Loathe You = !?!?Www@QuestionHome@Com

Best Answer - Chosen by Asker:

Best Friends for Never - Best Friends Forever
Revenge of the Wannabes - Revenge of the Nerds (1984)
Invasion of the Boy Snatchers - Invasion of the Body Snatchers (1956)
The Pretty Committee Strikes Back - The Empire Strikes Back; Star Wars Saga (1980)
Dial L for Loser - Dial M for Murder (1952)
It's Not Easy Being Mean - It's Not Easy Being Green
Sealed With A Diss - Sealed With A Kiss (1999)
Bratfest At Tiffany's - Breakfast at Tiffany's (1961)
P!. S!., I Loath You - P!. S!., I Love You (2007)Www@QuestionHome@Com

It's Not Easy Being Mean--It's Not Easy Being Green
Sealed With a Diss--Sealed With a Kiss
P!.S!. I Loathe You--P!.S!. I Love You

Other than that I'm not sure!. I'm not a Clique reader!.

?M?Www@QuestionHome@Com

ps i loathe you = ps i love youWww@QuestionHome@Com