Tiffani Thiessen Mamma Mia!

6/9/2010 7:23 PM PDT
Former "Saved by the Bell" and "90210" star Tiffani Amber Thiessen has never been a bigger star than she is now.

Looking like she's ready to pop, the expectant 36-year-old took a long walk around a golf course in L.A. on Wednesday.

Kelly Kapowski is due any second now.