Duchess Catherine visits ‘Downton Abbey’ set

Catherine, Duchess of Cambridge, meets actor Zack Bark.  (Chris Jackson / AFP / Getty Images)

The duchess, accompanied by writer Julian Fellowes, meets with Ealing Studios employees.  (Lefteris Pitarakis / AP)

Actor Robert James-Collier, who plays the under-butler Thomas, poses with the duchess.  (Chris Jackson / AFP / Getty Images)

The duchess talks to costume designer Anna Robbins.  (Chris Jackson / AFP / Getty Images)

The pregnant royal talks to actress Phyllis Logan, who plays housekeeper Mrs. Hughes.  (Chris Jackson / AFP / Getty Images)

The duchess takes a closer look at the lavish costumes.  (Chris Jackson / AFP / Getty Images)

Catherine is presented with a train for her son Prince George by actor Oliver Barker, who plays his namesake George Crawley on the show.  (Chris Jackson / AFP / Getty Images)

The duchess poses with Michelle Dockery, who plays Lady Mary Crawley, and actor Oliver Barker, who holds up a train for Prince George.  (Chris Jackson / AFP / Getty Images)

The duchess unveils a plaque as “Downton Abbey” writer-creator Julian Fellowes, a lord, watches.  (Chris Jackson / AFP / Getty Images)

The duchess chats with series stars Hugh Bonneville, who portrays Robert Crawley, Earl of Grantham, and Laura Carmichael, who plays his daughter, Lady Edith Crawley.  (Chris Jackson / AFP / Getty Images)

The duchess visits Downton’s kitchens and speaks with actresses Sopie McShera, right, and Lesley Nicol, center, who play kitchen servants Daisy and chef Mrs. Patmore, respectively.  (Chris Jackson / AFP / Getty Images)

The duchess chats with cast members Penelope Wilton (Isobel Crawley), left, Hugh Bonneville, and Laura Carmichael, center.  (Chris Jackson / AFP / Getty Images)

The Duchess of Cambridge is shown props as she visits the set-construction department.  (Chris Jackson / AFP / Getty Images)