See the Duchess of Cambridge and Her Majesty ride the rails in honor of the London Underground's 150th anniversary
Updated: Wednesday Mar 20, 2013 | 07:00 PM EDT
By: Nancy Mattia
More from PEOPLE
See More News
The Royal Tour may be winding down, but Duchess Catherine still has a few new ensembles left in her suitcase
4 of 8
The expectant duchess gets pinned down with a "Baby on Board" button, given to pregnant riders so fellow passengers will know to offer up their seats. The Daily Mail reported Kate as telling the queen, "I will have to wear it at home!"
Copyright © 2014 Time Inc. All rights reserved. Reproduction in whole or in part without permission is prohibited.
In partnership with AOL