We were always "Downton Abbey" fans, but now that the Duke and Duchess of Cambridge are watching it, it's officially the coolest show on TV.

While chatting with Andy Cohen, Allen Leech -- who plays Tom Branson -- revealed that the royal couple can't get enough of the Masterpiece series.

"I was actually at an event last week with Prince William, now the Duke of Cambridge, so yeah -- I met him last week, shook his hand," Leech said, according to Us. "He actually said, 'I’m a big fan of the show -- only now that my wife’s had a baby.'"

Sure, William. Blame it on the baby.

Season 4 of "Downton Abbey" will premiere on Jan. 5 on PBS. And if you're in New York this week, make sure to stop by the "Downton Abbey" tea truck for free tea and biscuits.

Related on HuffPost:

Loading Slideshow...
  • Season 4

  • Season 4

  • Season 4

  • Season 4

  • Season 4

  • Season 4

  • Season 4

  • Season 4

  • Season 4

  • Season 4

  • Season 4

  • Lady Mary and Brason

    "Downton Abbey" Season 4

  • Daisy

    "Downton Abbey" Season 4

  • Mr. Carson

    "Downton Abbey" Season 4

  • Lady Rose

    "Downton Abbey" Season 4

  • Lady Mary

    "Downton Abbey" Season 4

  • Branson and Sybil

    "Downton Abbey" Season 4

  • Season 4 cast: Tom Cullen

    Cullen will play Lord Gillingham, a family friend of the Crawleys who visits the family as a guest at a house party. He's <a href="http://www.huffingtonpost.com/2013/03/02/downton-abbey-lady-mary-boyfriend_n_2796504.html?utm_hp_ref=tv" target="_hplink">one of Lady Mary's potential suitors</a>, along with ...

  • Season 4 cast: Julian Ovenden

    Ovenden will play aristocrat Charles Blake, <a href="http://www.huffingtonpost.com/2013/03/02/downton-abbey-lady-mary-boyfriend_n_2796504.html?utm_hp_ref=tv" target="_hplink">another potential love interest for Lady Mary</a>.

  • Season 4 cast: Dame Harriet Walter

    Walter will play Lady Shackleton, an old friend of the Dowager Countess.

  • Season 4 cast: Joanna David

    David will appear in a guest role as the Duchess of Yeovil.

  • Season 4 cast: Nigel Harman

    Harman will play Green, a valet.

  • Season 4 cast: Dame Kiri Te Kanawa

    Te Kanawa will play a guest who sings in the house.

  • Season 4 cast: Shirley MacLaine

    Shirley MacLaine will also return for the Season 4 finale.

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3

  • Season 3