who played kelly's little sister on saved by the bell
List of Saved by the Bell characters Nicki Kapowski (portrayed by Laura Mooney) is Kelly’s tomboyish little sister who develops a crush on Zack. She becomes convinced that Zack feels the same way after he mixes up her phone call with Kelly's (while running the "Teen Line"). Although she is only thirteen and in the seventh grade, she nonetheless shows up at Bayside High to visit Zack, sporting a more feminine look and demanding a kiss. After trying various ploys to turn her off (including dressing up like a geek and trying to gross her out with a pet spider), Zack finally has to tell her the truth: he isn’t interested in her; he is in love with Kelly. More angry than hurt, she insults Zack for trying to scare her away instead of having the courage to tell a thirteen-year-old girl how he really feels.
Tiffani Thiessen Tiffani-Amber Thiessen (born January 23, 1974) is an American actress. She is known for starring as Kelly Kapowski on NBC's Saved by the Bell (1989–93) and as Valerie Malone on Fox's Beverly Hills, 90210 (1994–98), two TV series that met with great success. Thiessen has also starred in other TV series such as Fox's Fastlane (2002–03), ABC's What About Brian (2007) and USA Network's White Collar (2009–14), as well as in a number of TV movies, and she has also appeared in several films like Son in Law (1993), Shriek If You Know What I Did Last Friday the Thirteenth (2000), Hollywood Ending (2002) and Cyborg Soldier (2008).