Benedict Cumberbatch joined David Gilmour on stage to sing 'Comfortably Numb' on Wednesday night (28.09.16).

Benedict Cumberbatch performs on stage

Benedict Cumberbatch performs on stage

The 70-year-old musician was playing the third of his five-night residency at London's Royal Albert Hall and performed a rendition of the iconic Pink Floyd song from the band's 1979 album 'The Wall' with the 'Sherlock' star.

The track was originally sung by former Pink Floyd frontman Roger Waters - who left the band in 1985 - and although David has included the track in his solo sets since the band ended in 1994, he often recruits a guest vocalist to perform with him.

Aside from the 40-year-old actor, David Bowie has been among the vocalists to perform the track with Gilmour, as he stepped up to take part during a performance at the same venue in 2006.

And the 'Star Trek: Into Darkness' actor is no stranger to music, as he previously sang 'Can't Keep It Inside' for his film 'August: Osage County' in 2013, and is a regular attendee of gigs in London when he isn't filming.

The pair were introduced by mutual friends, and Benedict has said he was "only too happy" to accept the challenge of singing with David, when the veteran rocker approached him about the subject.

Many famous faces were in attendance for the show, with some taking to Twitter to express their excitement at the collaboration.

Gary Kemp of Spandau Ballet tweeted: "At the David Gilmour gig. If anyone needs me I'm in Heaven. (sic)"

Richard E. Grant shared a photo of himself and Benedict smiling, with the caption: "With Bruce&Sophie Robinson, Benedict Cumberbatch & pair of wandering hands at Dave Gilmour's Albert Hall concert. (sic)"