Role in the film
Chelsea is seen walking down the hall at school with Jenna when Max approaches them and says "Hello sweetheart" to Jenna. This causes them to turn around and stand watching as Keeble is asked where is going by Ms. Dingman.
Later on, Chelsea and Jenna are seen sitting in booth at a local ice cream shop, while they and a big group of local kids encourage Max — who is sitting in between them — to chug down milkshakes. The crowd cheers as he downs the last milkshake! Max lets out a loud belch and both girls laugh. Chelsea says to Max, "So, you did actually set up that whole 'monkey thing' at the cafeteria?" to which Max replies "Well, actually Tad is a chimpanzee." Jenna chimes in impressed saying "You're so devious!" Max then states "Well, it's really part of my whole new attitude — what I like to call my 'phat-itude.'"
Next Chelsea is seen dancing with the group of teens around the table where Max and Jenna are on top of dancing. When Principal Jindrake announces that Art, Music, P.E., and fun are discontinued, Chelsea turns to Jenna and says with sarcasm, "Great! Your boyfriend Max Keeble just got us hosed." Jenna returns the sarcasm in the look she gives to Chelsea, saying "He's just my paper boy. I never really liked him." When the students crowd Max, Troy McGinty, and Dobbs after school, Jenna and Chelsea look at each other with as much confusion as the rest of the student body when one foreign football student speaks in English. When Max is victorious, the BFFs approach him to invite him to a party where only 9th graders are invited, to which he declines embarrassing Jenna and they walk off.