Reese Witherspoon. Picture: AP

The Duke and Duchess of Cambridge sent Reese Witherspoon a Union Jack onesie after her son was born.

The Sweet Home Alabama actress and husband Jim Toth welcomed their baby boy Tennessee James into the world last month and the royal couple - who Reese met when they visited Los Angeles last year - were among the first to send a gift and a handwritten note.

Witherspoon's Water for Elephants co-star Robert Pattinson, who hid out at her California ranch following his break-up with Kristen Stewart, also sent a lavish gift - a cradle from Posh Tots worth nearly $2000.

A source told America's Star magazine: "Rob was one of the first to call and he even promised unlimited babysitting services. The baby is the toast of Hollywood."

Witherspoon - who has two children, Ava, 13, and Deacon, eight, from her marriage to Ryan Phillippe - previously joked she was upset not to be invited to Prince William and Catherine's wedding because she had asked them to attend hers.

Speaking before the pair married, she said: "I can't even contain my enthusiasm for the royal wedding.

"I'm kind of bummed I'm not invited to the royal wedding. My girlfriend asked me if I was invited. Well, no, but I invited them to my wedding."

The West Australian

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