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You saw her in a one-piece last week, but now Tiffani Amber Thiessen is showing off her bikini bod!

The former "Saved by the Bell" actress, who just turned 40, put her killer physique on display while on vacation in Mexico for her birthday.

Sporting a mismatched orange and white two-piece, the mother-of-one also gave fans a look at her rarely-seen lotus tattoo on her lower stomach.

It's clear Kelly Kapowski has kept in shape since graduating from Bayside High!

She's hardly the only '90s hottie who still looks AMAZING these days though -- check out the gallery above to see what some of your favorite stars from that decade look like now.

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