In 1992, Thiessen graduated as valedictorian at Valley Professional High School in Studio City, Los Angeles.
Thiessen participated in beauty pageants during her childhood and was crowned Miss Junior America in 1987.
She then continued with starring in spin-off Saved by the Bell: The College Years in its single season (1993–94) and in television movie Saved by the Bell: Wedding in Las Vegas (1994), which marked the end of the original Saved by the Bell series.
In 1994, after her tenure on Saved by the Bell had ended, Thiessen landed the role of Valerie Malone in Fox's Aaron Spelling-produced hit teen-drama Beverly Hills, 90210, to fill the void after Shannen Doherty's departure.
The following year, she graced the cover of Teen magazine, having won the magazine's "Great Model Search".
In 1989, she was named Cover Girl magazine's "Model of the Year", and landed her first role of Kelly Kapowski on NBC's television sitcom Saved by the Bell, starring until its end in 1993.
While starring in 90210, Thiessen began to take on continuous dramatic leading roles in television films: The Stranger Beside Me and She Fought Alone in 1995, Sweet Dreams and Buried Secrets in 1996.
The success of the show gave her career a boost and Thiessen received Young Artist Award nominations for Outstanding Young Ensemble Cast in 1990 and Best Young Actress in an Off-Primetime Series in 19.
Simultaneously, Thiessen guest starred on series such as Married... In 1992, she starred in her first television movies Saved by the Bell: Hawaiian Style and A Killer Among Friends, making her film debut in Son in Law in 1993.
After her departure from the show, she appeared in a number of films, including Speedway Junky (1999), From Dusk Till Dawn 2: Texas Blood Money (1999), Love Stinks (1999) and The Ladies Man (2000); she also guest-starred on News Radio (1999), Two Guys and a Girl (2000), Just Shoot Me! In 2000, she was featured in the music video for "You're a God" by Vertical Horizon, portraying a beauty pageant contestant, in her first music video appearance.
Tiffani-Amber Thiessen (born January 23, 1974) is an American actress.
She is known for starring as Kelly Kapowski-Morris 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.