Julia Roberts has offered to babysit for Brad Pitt and Angelina Jolie as a wedding present.

The actress has starred alongside Brad in two films, 'The Mexican', and 'Ocean's Eleven' and was happy to hear the news of his engagement to Angelina, and has even offered to look after the six children they raise - Maddox, 10, Pax, nine, Zahara, seven, Shiloh, five and three-year-old twins Knox and Vivienne - if they need some quiet time.

She told E! news: ''Oh yes, it's exciting news. It's always nice when you're ready to hitch your wagon for eternity to somebody.''

Asked about the gift she'd choose for the wedding, she added: ''That's a ways down the road, but it's starting to be, now that people are starting to ask me and put pressure on me, so - babysitting. Yeah, that's good.''

While Brad is thought to have proposed at Christmas time - with a custom designed ring believed to be worth up to £500,000 - he and Angelina have only just made their engagement public, and jetted off on holiday with their children to the Galápagos Islands to celebrate.

The family arrived by private plane in Baltra, Ecuador on Tuesday (18.04.12) before boarding a luxury yacht to the exclusive Royal Palm Hotel on the islands.

A source in the local mayor's office said: ''We were informed that they arrived at the airport in Baltra yesterday. Then they made their way over to a villa in the Galápagos Islands.''