But the actor hasn't entered into a legalised three way marriage (that would be silly, and besides, he's very heterosexual) - he was overseeing the civil ceremony of two male friends in Ibiza at the weekend.
The 'Star Trek Into Darkness' star agreed to officiate at the gay wedding on the White Isle on Saturday.
He told The Sun: “It’s a very private, lovely thing to be asked to do.
“Of course I’m going to make a joke after it if it goes well — ‘I do weddings. Next will be children’s parties and bat mitzvahs’.
“It’s a mainly Jewish and gay audience so hopefully they will be lenient towards me.”
Also at the ceremony between the two unknown men was writer Julie Burchill, who said: “The hotel was lush, the bridegrooms were beautiful, and the man who married them (to each other) was Benedict Cumberbatch — so yes, it was quite a blast.”
Meanwhile, Benedict is set to feature heavily at the 38th Toronto International Film Festival with no less than three of his films featuring at the event
'The Fifth Estate', which sees him playing Wikileaks founder Julian Assange, will open the event on September 5.
He will also feature in '12 Years a Slave' and 'August: Osage County', which he stars in alongside Meryl Streep and Julia Roberts.
LONDON, ENGLAND - MARCH 12: Benedict Cumberbatch arrives at the 2013 South Bank Sky Arts Awards at The Dorchester on March 12, 2013 in London, England.
DESCRGHENT, BELGIUM - OCTOBER 12: Benedict Cumberbatch actor in Parades End poses for a photoshoot at the 39th Ghent Film Festival on October 12, 2012 in Ghent, Belgium.
DESCRLONDON, UNITED KINGDOM - APRIL 14: Benedict Cumberbatch sighting on set of Sherlock on April 14, 2013 in London, England.
DESCRLONDON, UNITED KINGDOM - SEPTEMBER 06: Benedict Cumberbatch attends the premiere of 'Tamara Drewe' at Odeon Leicester Square on September 6, 2010 in London, England.
DESCRLONDON, ENGLAND - DECEMBER 05: Actor Benedict Cumberbatch attends the Moet British Independent Film Awards at Old Billingsgate Market on December 5, 2010 in London, England.
DESCRVENICE, ITALY - SEPTEMBER 05: Actor Benedict Cumberbatch attends the 'Tinker, Tailor, Soldier, Spy' premiere at the Palazzo del Cinema during the 68th Venice Film Festival on September 5, 2011 in Venice, Italy.
Actor Benedict Cumberbatch attends the "Star Trek Into Darkness" premiere at AMC Loews Lincoln Square on Thursday, May 9, 2013 in New York.
DESCRLONDON, ENGLAND - MAY 02: Benedict Cumberbatch attends the UK Premiere of 'Star Trek Into Darkness' at The Empire Cinema on May 2, 2013 in London, England.
Actor Benedict Cumberbatch at the UK Premier of "War Horse" on January 8, 2012
DESCRNEW YORK, NY - MAY 09: Benedict Cumberbatch leaves the 'Late Show with David Letterman' at Ed Sullivan Theater on May 9, 2013 in New York City.
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