Shaw, 27, plays Paige McCuller, Emily's (Shay Mitchell) ex-girlfriend, who was last seen in season five as she and her family moved to California before the show's five year jump, according to Entertainment Weekly.
Shaw's return follows the announcement of another blast from the past as Brent Daugherty also makes his return this series in what showrunner Marlene King is calling the "season of homecomings".
"There are a lot of old faces that are going to feel like new faces when we see them again this year," she said.