By Simon Neville and Alanah Eriksen
Published: 06:18 BST, 11 April 2012 | Updated: 09:25 BST, 11 April 2012
She has three children under the age of eight.
But while other mothers might fret about their figures or feel shy about their stretch marks, Julia Roberts was happy to show off her enviable beach body.
She proved that giving birth hasn't stopped her from staying in shape as she splashed in the sea with her cameraman husband Danny Moder and their children – twins Hazel and Phinnaeus, both seven, and four-year-old Henry.
Beach babe: Julia Roberts, 44, showed off her bikini body as she played with her children on the beach in Hawaii
Wearing a black bikini with gold buckles by designer Tory Burch, the 44-year-old also appeared toned and slender while trying out boogie boards.
After promoting her latest film, Mirror Mirror, the actress is holidaying in Hawaii.
She also showed off her lower back tattoo which spells out the names of her children.
Tribute: Julia showed off her lower back tattoo which has her children's names - twins Hazel and Phinnaeus, both seven, and four-year-old Henry
He's not so bad either! Julia's husband, cameraman Danny Moder also had an enviable body
Hands-on mother Julia recently revealed that she enjoys scaring her children when she's at home.
She explained: 'If I hear them coming and they don't know where I am in the house, I crouch down in their private space and [when] they come in, I jump out. Really, little people can just catch air. They just vault.'
She added: 'I realised I was getting too much joy from it, so I've had to tone it down. It's so wrong. It's like child abuse.'