Legally Blonde 3 has gotten a cautiously optimistic update in the wake of Barbie's success. The original 2001 movie Legally Blonde followed spoiled sorority girl Elle Woods (Reese Witherspoon) as she went to Harvard in an attempt to win back her ex, only to realize that she genuinely wanted to succeed as a lawyer. The movie spawned the sequel Legally Blonde 2: Red, White, & Blonde and the TV movie spinoff Legally Blondes, but while Legally Blonde 3 was announced to be in development as early as 2018, the movie has yet to get any closer to kicking off production.
https://screenrant.com/legally-blonde-3-movie-future-updates-luke-wilson-response/