Laggies (2014)
Synopsis: "When 28-year-old Megan (Keira Knightley) attends her 10-year high-school reunion, she realizes that very little in her life has changed. An unexpected marriage proposal from her boyfriend sparks a panic in Megan, causing her to wander off into the night.

She meets 16-year-old Annika (Chloe Grace Moretz) who is with friends and proceeds to get drunk with the teens. Deciding she needs a break from her unfulfilling life, she tells her boyfriend she's going to a seminar but hangs with Annika."