Krisstina is a singer who that Greg's school had at assembly because her lyrics are positive. According to Greg, Krisstina calls herself an "International Pop Sensation", but her world tour shows that she has never been out of Greg's state. Her lyrics and sayings are similar to those of Joshie. She only appeared in The Third Wheel.
- Diary of a Wimpy Kid: The Third Wheel (First and only appearance)
- Krisstina's song lyrics appear in Diary of a Wimpy kid: The Third Wheel. The chorus is: Trust in your dreams and you will see, just how happy your heart can be, reach for the stars and never stop! You're a winner, you'll reach the top!''
- Her lyrics are similar to Joshie's, with both having positive lyrics.
- The stops of her “world tour” are Shop-Mart Superstore, Middletown Shopping Mall, Roll-a-Round Skating Rink, the town park through the Town Park Gazebo, Rickman Auto Center, Route 1A Bowling Alley, and Speediescrub Car Wash.