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Was Kate Middleton picking up princess tips?

The royal-to-be enjoyed a lunch Wednesday with future step-mother-in-law, Camilla, the Duchess of Cornwall, 63, at The Berkeley in London.

No word on whether the duo were discussing wedding plans, but an onlooker tells that "they looked to be enjoying a pleasant conversation."

And that's not the only royal expert the bride, 29, has been consulting with.

On Tuesday, St. James' Palace confirmed that Sir David Manning, former British ambassador to the U.S., is currently mentoring Middleton on foreign affairs and matters of the state. Prior to working with Middleton, Manning advised both Prince William and Prince Harry.