With "Sherlock" filming season 3 episode 3 with Benedict Cumberbatch and Martin Freeman, it appears [spoilers] Amanda Abbington aka Mary Morsten will also appear in "His Last Vow."

A slew of recent set photos taken in Cardiff by Wales Online show Benedict Cumberbatch and Martin Freeman, but Freeman's long-term real-life partner Amanda Abbington is also seen.

The long speculated wedding episode between John Watson and Sherlock Holmes character Mary Morsten has been confirmed to be the center of episode 2.

"Hot off the presses from 110 years ago, John does get married," Moffat jokes. "We hoped that you wouldn't sneak ahead and read the books."

According to spoilers, filming for "His Last Vow" is expected to end early September, and it appears Amanda Abbington aka Mary Morsten will join the fray in some manner.

"Working with Martin on 'Sherlock' is really quite inspiring, 'cause he's so good at his job. And he and [Benedict Cumberbatch] have this fantastic chemistry," says the English actress.

"Coming into 'Sherlock' you have to up your game, 'cause they're so good together."

Abbington was recently photographed on set in a wedding dress, so it is all but officially confirmed that she's set to play Morstan. However, Abbington is reportedly sworn to secrecy until the season actually airs.

Freeman and Abbington met in 2000 on the set of "Men Only." And while the pair have two children, they have yet to marry.

So, what does Mary Morsten have to do in "Sherlock" season 3 episode 3, and will more spoilers surface before filming is completed?