Wimpy kids, unite.

The fifth book in the incredibly popular “Diary of a Wimpy Kid” illustrated novel series, “The Ugly Truth,” is due in stores nationwide Tuesday.

And at least two Maine bookstores are planning free book release parties to celebrate.

The Borders store at 430 Gorham Road in South Portland, and the Borders at 147 Bath Road in Brunswick, are both planning release parties starting at 6 p.m. Tuesday.

Both free events will feature a book discussion, games, art activities and giveaways of “Wimpy Kid” books and merchandise. The events are geared for ages 8 to 12.

The “Diary of a Wimpy Kid” series by Jeff Kinney focuses on a sixth-grade boy dealing with the various hurdles of childhood and tweenhood. In this newest book, he faces the pressures of boy-girl parties, among other things.

The series was so popular it was made into a live-action film, “Diary of a Wimpy Kid,” which came out in March.

For more information on the Borders release parties, go to www.borders.com, or call 775-6110 for the South Portland store and 721-1178 for the Brunswick store.

For more information on the book, go to www.wimpykid.com.