Boston Blue is bringing in former Dancing With the Stars winner Xochitl Gomez for a role opposite Donnie Wahlberg's onscreen son after his recasting. CBS announced on Friday, November 7, that Gomez, 19, will guest star as Penny in upcoming episodes of the Blue Bloods spinoff. Penny is described as "a quick-witted, charming young woman with a mysterious past who crashes" into Sean's (Mika Amonsen) life. Gomez's first episode will air on November 21.