Cult
The actor was devastated when his mum Helen, 67, passed away following a fight against cancer this month.
Tennant has been filming the Christmas episode of Doctor Who with Kylie, who has battled against the illness herself and been a great source of comfort since he returned to the set.
A source told the Daily Star: "Kylie knows how terrible cancer is and she took a lot of care of David."
More: Cult, Doctor Who
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