Tiffani Thiessen Drops 45 Pounds Tiffani Thiessen attends the Juno Jr launch at FAO Schwarz on Sept. 25, 2010, in New York City, left, and appears at the Pacific Design Center on Feb. 15, 2012, in West Hollywood, Calif., on the right. Thiessen credits her personal trainer and meal-planning regimen for her 45-pound weight loss.