peter capaldi doctor who wedding ring bbc 'Doctor Who': Peter Capaldi wears wedding ring in Season 8   How will it be explained?

While fans got their first look at Peter Capaldi in his “Doctor Who” costume, there’s one accessory they couldn’t see. In photos from the set, which can be viewed on the Daily Mirror, Capaldi is seen wearing a wedding ring on his finger.
According to Ryan Farell, a fan observing the set, that’s Capaldi’s own wedding ring, which he rarely takes off for roles. That leaves a bit of explaining for the Doctor to do, though.
Will the show acknowledge it as being due to a wife, or will this be one of those things that just sits out there being ignored? As far as who it could be for, the best bet is River Song (Alex Kingston). 
Showrunner Steven Moffat has already admitted that he’s tempted to bring Kingston back to reprise her role at some point. Certainly, if that happens at some point, she’d make a big show of it. 

In the meantime, fans will have to wait and see if an official explanation ever comes. “Doctor Who” Season 8 premieres later in the year.
Posted by:Chris E. Hayner

Chris E. Hayner is equal parts nerd, crazy person and coffee. He watches too much TV, knows more about pro wrestling than you do and remembers every single show from the TGIF lineup. You may have seen him as a pro-shark protester in "Sharknado 3." His eventual memoir will be called "You're Wrong, Here's Why..." TV words to live by: "I'm a firm believer that sometimes it's right to do the wrong thing."