Last month, rumours surfaced claiming the American sweetheart was expecting a baby with her husband Danny Moder.
The 51-year-old Golden Globe winner appeared curvier than usual while enjoying romantic holiday near her home in Hawaii.
The couple, who have been married for 17 years, looked happier than every as they cuddled up on the sand.
They are already parents to twins Hazel and Phinnaeus, 14, and 11-year-old son Henry.
She has referred to her children as "a complete reflection of the affection" she and Danny have for each other.
Julia and cameraman Danny married at Roberts' ranch in Taos New Mexico in July 2002.
They now live in Malibu, California, around 45 minutes drive from Hollywood and Los Angeles.
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