Kate Middleton Wears Loose-Fitting Silver Gown to Palace Dinner

 Lefteris Pitarakis/PA Wire

Stunning in silver!

Amidst pregnancy rumors, Duchess Kate stepped out Thursday in a loose-fitting, floor-length chiffon satin asymmetric gown by British designer Jenny Packham. Prince William and his wife, 29, attended a benefit dinner for the National Memorial Arboretum Appeal at St. James' Palace in London.

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The world has been on baby bump watch for Kate since she politely declined to sample peanut paste during her and William's Nov. 2 visit to a Denmark UNICEF distribution center. (Although Kate is not allergic to peanuts, pregnant women are often advised to avoid peanut products to prevent allergies in their babies-to-be.)

But a royal insider tells the new Us Weekly — on stands now — that Kate might not be expecting just yet.

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"She's not comfortable eating in front of cameras," the insider said. "What if she didn't like it and made a face? That expression would then be on every newspaper." See more pics of William and Kate at the benefit dinner.

A spokesman for the couple tells Us the policy is "to never confirm or deny [pregnancy] rumors," but an insider insists: "If and when there is an announcement to make, it will be made by the palace as soon as it's safe to."

If Kate is expecting, she might not have her hubby by her side throughout her entire pregnancy. England's Ministry of Defense said in a statement Thursday that early next year, William, 29, will be deployed to the Falkland Islands for six weeks. He will join a crew of three other RAF personnel as part of his training and advancement as a Search and Rescue Pilot. 

VIDEO: Will and Kate talk babies!

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Should Will and Kate have a daughter as their firstborn, a new ruling will allow her to someday be queen. Upending centuries of royal law, leaders of the 16 countries that recognize the British monarchy recently agreed that a firstborn daughter should be able to ascend the throne even if she has younger brothers.

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