Jennifer Aniston's unusual choices of food and drink were "definitely noticed" at her engagement party.
The 43-year-old actress the 41-year-old screenwriter announced their engagement in August.
In November it was rumoured that Jennifer was pregnant with her first child, but the couple discounted these claims.
Jennifer and Justin held their engagement fete on Sunday.
Partygoers found it odd that Jennifer didn't drink any alcohol or eat the sushi that was served.
"Jen loves a party, so it was definitely noticed at her engagement event that she was only on water," a source told British newspaper The Mirror.
"People have also been commenting on her changing her work plans for the foreseeable future - she said it was to concentrate on planning the wedding and to be closer Justin, but now it's being suggested it's to make way for a baby.
"It would be a fantastic piece of news for the couple to end the year on - she seems so happy recently."
The pair are rumoured to be getting married in Hawaii this month.
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