Is Josh Groban the Biggest 'Downton Abbey' Fan Ever? Allen Leech Puts Singer to the Test For 'Quizzed': Watch

What is a weekend? Josh Groban definitely knows. But how are the rest of his Downton Abbey smarts?

Star Allen Leech, who plays chauffeur-turned-beloved-son-in-law Tom Branson in the series that made a jump to the big screen this September, joined Groban for Billboard's new series "Quizzed."

In the episode, Leech takes Groban -- who is dressed to the nines in proper 1900s attire -- through three rounds of trivia from the show: true-or-false, general trivia and quotes.

The singer starts off strong on the true-or-false questions, but does get tripped up on the timing of -- spoiler alert -- Matthew Crawley's (Dan Stevens) death.

From Lady Mary's (Michelle Dockery) engagements, to the historical tragedy that set the show in motion, to what Mrs. Carson (Phyllis Logan) always keeps tied to her dress, Leech quizzes Groban on the facts of the series.

Overall, is Groban's Downton expertise enough to impress the Dowager Countess? Watch the full "Quizzed" above to find out.

The first installment of "Quizzed" saw Office star Rainn Wilson testing Billie Eilish?'s knowledge of the long-running NBC series. And more episodes featuring Chance the Rapper, Charlie Puth, Meghan Trainor, and Grace VanderWaal are coming soon.


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