AJ Michalka as Lainey Lewis (Season 3 -- 4; recurring 1 -- 2, 5 - present), Erica 's best friend and one of the most popular girls at school, whom Barry has had a lifelong crush on. To the surprise of many, Lainey kisses Barry at a party in the first - season finale, the two slowly grow closer together in season two, and eventually become an unlikely couple. Following the fourth season, she has gone to attend fashion school in Savannah, Georgia and ended her relationship with Barry.
who plays erica's friend on the goldbergs
AJ Michalka