Aniston , 43, who is engaged with actor Justin Theroux, was also seen avoiding alcohol and seafood at her own intimate engagement party, reported Daily Mail.
"They had a margarita bar, but she didn't go near it, opting for water instead.
It was so unlike her and didn't go unnoticed. She was also picky with what she ate, and didn't touch the huge sushi platter, which is one of her favourite foods," a source said.
She was seen furniture shopping with fiance in Los Angeles and kept well and truly covered up in the unusually loose jacket which appeared to be several sizes too big.