Tiffani Amber Thiessen (born January 23, 1974) is an American actress who is best known for her television roles as Kelly Kapowski-Morris on the NBC sitcom Saved by the Bell from 1989 to 1993, Valerie Malone on the Fox teen drama series Beverly Hills, 90210 from 1994 to 1998, and  as Elizabeth Burke on the USA Network police procedural drama series White Collar, from 2009 to 2014.

She voiced Misty the Wonderful Witch and the Mermaids in the Jake and the Never Land Pirates episodes "Season of the Sea Witch", "Cap'n Croak", and "Misty's Magical Mix-Up!". She will play Celeste in the ABC TV show American Housewife.