Maybe I'm getting old, but I really don't think Kesha's song "Tik Tok" is the best song to use in a movie that is blatantly geared towards kids.  They skip offensive lines in the trailer (last scene of the trailer), but keep in mind this is a song that makes reference to brushing teeth with Jack Daniels, getting drunk, and boys trying to touch her junk.

Diary Of A Wimpy Kid: Rodrick Rules Online Trailer