The star expressed his admiration in a note to his castmate when filming wrapped.
Piper says Helena Bonham Carter has the right 'madcap energy' to play the Time Lord.
The actor may not have got a ring, but she did get the part of the Red Queen.
The historical drama series earned the most nominations in this year’s TV category.
The Crown stars are reuniting for the Comic Relief 'Cinderella' special on Christmas Eve.
The Crown star Olivia Colman has said she swore when she met Queen Elizabeth II - the figure she portrays on the Netflix series
War Child UK are auctioning off a special experience perfect for fans of the Netflix series.
The 53-year-old is currently in a relationship with 32-year-old Rye Dag Holmboe.
The 53-year-old actress has been dating the 32-year-old writer for about a year.