Nineties fans, rejoice!

Saved by the Bell actress Tiffani Thiessen, who played Zack Morris' love interest Kelly Kapowski, is expecting her second child.

Tiffani and her husband Brady Smith already have a four-year-old daughter named Harper Renn, so they'll be well prepared for a new baby!

Kelly revealed the happy news on Instagram, sharing a sweet family snap with the caption, "We are excited to announce the news that we are expecting. Harper could not be more thrilled to have a sibling and a playmate."

Far from being a jealous big sister, little Harper is "can’t wait to turn into a little mommy," Tiffani revealed in a recent interview. So cute.

Shortly before Christmas, Mark-Paul Gosselaar, who played Zack on the show, announced that he and his wife were expecting their fourth child.

Could a Saved By The Bell themed baby shower be on the cards?! We can't wait for our invite!