By Michael Ausiello
October 08, 2010 at 03:42 PM EDT

Image Credit: Glenn Harris/PR Photos; Ken Regan/ShowtimeI see an emergency Adderall refill in a certain harried nurse’s future, and here’s why: Kyle XY beauty Jaimie Alexander is checking into Nurse Jackie for a sizeable arc as Jackie’s (Edie Falco) wild, immature sister-in-law.

Alexander’s character, Tunie—who will appear in at least four episodes of the Showtime dramedy’s upcoming third season—is Kevin’s (Dominic Fumusa) never-before-seen younger sibling.

In the final moments of Jackie‘s second season, Falco’s increasingly unhinged title character found herself at the center of an intervention staged by her husband and BFF Eleanor (the awesome Eve Best). In other words, probably not the best time for an unannounced visit from an annoying relative.