Orlando bloom and Miranda Kerr sure can keep a secret! Not only did the lovebirds recently pull off a totally under-the-radar wedding, but a source tells the new issue of Us Weekly that the Victoria's Secret model, 27, has been keeping something else classified as well: She's pregnant!

"She's definitely pregnant...Miranda's thrilled," says a source close to the Australia native, who wed the actor, 33, at an undisclosed location -- reportedly in the Caribbean -- less than a month after revealing their engagement on June 21. "She's telling all her friends, mostly other models, about it."

While the pal says no official announcement will be made, the couple of three years' big news will be hard to keep hidden.

"She poses in lingerie," says the friend of Kerr, who has modeled for Victoria's Secret since 2007. "It will be obvious soon enough."

The bride, who kicked off a Caribbean getaway with Bloom at Anguilla's Viceroy resort on July 17, certainly hasn't hidden her desire for a child.

"I have always been very open about wanting to be a mother one day," she recently told an Australian newspaper. "And I've always thought Orlando would be a great dad!"

Check out hot pics of Miranda heating up New York's meatpacking district!

See Miranda's nearly nude GQ photos from earlier this year here and here

Click for more great Miranda Kerr pictures: