The stars were seeing green this weekend -- as they spent the past three days celebrating St. Patrick's Day!

And, thankfully, they were tweeting out pics the entire time.

Mariah Carey celebrated with her two little leprechauns, posting an adorable photo of twins Moroccan and Monroe sporting party hats on Sunday. Note Monroe's "Queen of the Green" crown ... looks like someone's taking after her mama!

Heidi Klum shared a shot of herself drinking some green beer. And she wasn't the only one indulging herself in the emerald beverage.

19-year-old Patrick Schwarzenegger posted a shot of his colorful brew as well. From the looks of it though, he was in Mexico this weekend ... where the drinking age is 18.

Check out the gallery above to see who else was partying it up this weekend!

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