Baby on board!

Jennifer Aniston is in fact pregnant — doctors have confirmed to In Touch that she is somewhere between two and four months along.

This comes shortly after In Touch exclusively revealed that the 47-year-old is expecting baby No. 1 with husband Justin Theroux and published photos of the mama-to-be flaunting her baby bump while vacationing in the Bahamas.

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Jen in a bikini pre-pregnancy.

“It looks as though she could be between two and four months pregnant,” one doctor who has delivered multiple babies tells the mag. Another doctor says, “The telltale signs are the isolation of the weight gain in the abdomen and the lack of weight gain in the legs, arms and buttock region.”

RELATED: Jennifer Aniston Covers Up Her Bump While Out in NYC

A third doctor notes that the Friends star appears to be in the first trimester, explaining, “This doesn’t look like someone that ate a big lunch, the stomach just doesn’t bloat like that. This looks like classic third month of pregnancy.”

For more — and to see the first pictures of Jen’s bump — pick up the new issue of In Touch, on newsstands now!

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