Is Sarah Silverman having a baby ... or did she just have too much to eat?

The comedian posted a photo of her WhoSay account last night, where she and an unknown guy are seen holding onto her bare and big belly.

"It's a burrito!" she tweeted along with the photo ... but is it actually a baby?

We asked her rep, who tells toofab "It was a joke. She is not pregnant."

Check out which stars are actually knocked up in the gallery above!

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