Kate Middleton on June 3, 2012 in London, England. Credit: Danny Martindale/WireImage.com

Kate Middleton may be royalty, but she's also a happy homemaker!

If her husband, Prince William, 30, doesn't undertake another tour with the RAF, the Anglesey-based pair will officially make London their base. "They'll want the extra space and security" if there's a baby on board, a source recently told Us Weekly of their proposed move to Kensington Palace.

Middleton's getting a head start by redecorating the apartment they'll inhabit, which once belonged to the late Princess Margaret, Countess of Snowdon, who passed away in 2002.

"She's keen to work with interior designer Kelly Hoppen," said a source, "but she wants to do a lot herself." Structural work on the pad begins this September.

The move makes sense to William, who recently told Katie Couric he's "keen to have a family."

"This is why William has chosen not to share his future RAF work plans until next summer," the source explained. "If they're expecting, it will be full-time London for them."

And rest assured, once Middleton, 30, hits the three-month mark, "the pregnancy will be announced," the insider told Us. "It won't be hidden."