CAMERON DIAZ rushed into her marriage to rock star Benji Madden – and now The National ENQUIRER can exclusively reveal that insiders are speculating that the 42-year-old star is pregnant!

“They couldn’t be happier,” a source told The ENQUIRER.

As The ENQUIRER reported in our December 29 issue, the love-struck duo – who began dating this past May – became engaged late last year.

The glamorous couple then hurriedly hosted a January 5 backyard wedding at Cameron’s Beverly Hills mansion.

Their guests included Reese Witherspoon, Gwyneth Paltrow and Samantha Ronson. New sister-in-law Nicole Richie – married to Benji’s twin brother Joel – was a bridesmaid, alongside Cameron’s sister, Chimene, Drew Barrymore and Cameron’s assistant, Jesse Lutz.

As The ENQUIRER revealed in November, Cameron had put her $90 million fortune at risk by not asking Benji to sign a prenup – alarming her business team.

“It’s totally insane, but Cameron’s so crazy in love right now, no one can get through to her,” a longtime pal told us then.

But all that was forgotten as Cameron shone in a beautiful white bridal gown.

“Her dress was absolutely perfect,” an insider said. “It was pleated and lace, with short sleeves and a low-cut back.”

Cameron walked down the aisle to Nat King Cole’s “Stardust,” with Lionel Richie and Ryan Adams later serving as the live entertainment.

Cameron told guests: “I waited because I didn’t want to settle. Now I got the best man ever. My special man. He’s mine!”