No. Rachel McAdams did not play a small part in the first Bring It On movie.
In the movie "The Hot Chick" (2002), just before cheerleading competition and prom, Rachel McAdams’ character finds herself stuck int he body of Rob Schneider.
In 2001, McAdams landed her debut television performance, playing a bulimic girl in the Disney series The Famous Jett Jackson. She made her film debut one year later, in the Canadian/Italian-produced film My Name is Tanino.
McAdams earned her first significant accolade for a supporting role in 2002's Perfect Pie; for her role in the low-budget film, she was nominated for a Genie Award (Canada's Oscar).
She hit it big after her appearance in Mean Girls and The Notebook. Know more about the life and career of Rachel McAdams at Biography.com.
Of interest, Dance.com shares 16 Movies With Cheerleaders For When You Just Wanna Have Fun.