SPOTTED: An unexpected who's who — including House Minority Leader Kevin McCarthyKevin McCarthyOvernight Defense & National Security — Texas hostage situation rattles nation The Hill's Morning Report - Presented by Facebook - Democrats see victory in a voting rights defeat Former acting Defense secretary under Trump met with Jan. 6 committee: report MORE (R-Calif.), Martha Stewart and Nicky Hilton Rothschild — coming together in royal fashion to honor Queen Elizabeth II and the legacy of the late Supreme Court Justice Ruth Bader GinsburgRuth Bader GinsburgSecond gentleman Emhoff acts as public link to White House Former colleagues honor Reid in ceremony at Capitol Congressional Progressive Caucus backs measure to expand Supreme Court MORE.

The unlikely gathering of guests mixed and mingled Thursday at an intimate ceremony and dinner at the Library of Congress to mark the second annual Ruth Bader Ginsburg Women of Leadership Awards.

The honor from the Dwight D. Opperman Foundation, which Ginsburg helped establish before her death last year, recognizes “an extraordinary woman who has exercised a positive and notable influence on society and served as an exemplary role model in both principles and practice.”

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This year's honoree was none other than the queen herself. British Ambassador to the United States Karen Pierce accepted the award on behalf of the United Kingdom's reigning monarch.

In a letter to her majesty, President BidenJoe BidenMadame Tussauds unveils new Biden and Harris figures US raises concerns about Russian troop movements to Belarus Putin tests a model for invading Ukraine, outwitting Biden's diplomats MORE recognized her "strength and integrity through an era of unprecedented global challenges" that have "set an example for the world that will continue to inspire leaders for generations to come."

Supreme Court Chief Justice John Roberts also commended the U.K. head of state for her "devotion to service and to the rule of law."

"It has inspired a great many others around the world to give of themselves for the broader good," Roberts said in a statement, adding, “Your Majesty and my late colleague Justice Ginsburg personified those virtues in different arenas, to be sure, but with the same extraordinary level of commitment and, indeed, courage."

McCarthy praised Elizabeth as the "most deserving woman of leadership of our time."

Hosted by The Opperman Foundation's Julie Opperman, other revelers eyed at the soiree included: James Rothschild, David Rubenstein — who was seen chatting with McCarthy — Librarian of Congress Carla Hayden, Saudi Arabia's Ambassador to the United States Princess Reema bint Bandar, Amy Baier, National Portrait Gallery Director Kim Sajet, NPR's Nina Totenberg, Corporation for Public Broadcasting CEO Patricia Harrison and State Department assistant secretary for oceans, environment and science Monica Medina, among others.