Prince William is still awaiting a very important question from Prince Harry.

During a visit to a London mental health charity on Wednesday, the Duke of Cambridge joked to radio DJ Ronan Kemp that his younger brother has yet to ask him to be the best man in his upcoming spring wedding to Meghan Markle.

"He hasn't asked me yet, just to clear that up," the 35-year-old royal revealed. "It could be a sensitive subject."

Watch below:

Prince Harry, 33, and Markle, 36, are reportedly breaking tradition in many ways, one being with the decision to potentially anoint a best man and maid of honor. Prince William did this at his own wedding to Kate Middleton, choosing his brother to serve as best man. The Duchess of Cambridge chose her younger sister, Pippa Middleton, to stand by her side as maid of honor.

As for Markle, who will say "I do" to Prince Harry at St. George's Chapel, Windsor Castle on May 19, Us Weekly reports that she's already chosen a maid of honor, who many believe to be her friend and stylist, Jessica Mulroney.

ET has also learned that the former Suits star would like both of her parents to be a part of the nuptials in a special way. A source tells us she's already asked her father, Thomas, to walk her down the aisle.

Hear more on everything we know about the royal wedding so far in the video below!

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