Shiri Appleby
is bumpin on the beach -- no, literally ... that baby bump is huge!

The former "Roswell" star showed off her pregnancy curves in a cute aqua string bikini on Friday. A day at the beach was probably well needed for the mom-to-be because she looks ready to pop.

The brunette beauty tweeted, "T minus 20 days" along with the bikini pic. We think it might be sooner  judging from that round belly!

This will be the first child for Shiri and her fiance, Jon Shook, who got engaged last July!

Gotta love a girl who embraces her baby bump -- she looks absolutely radiant! Click "Launch Gallery" above to see even more expecting celebs!

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