They both play slightly uptight characters on their respective shows – Sherlock and Downton Abbey.
But it seems in real-life Benedict Cumberbatch and Laura Carmichael are far from boring as they proved when they attended Lady Gaga’s much talked about Roundhouse show in London on Sunday evening.
The actors, who are both the toast of British talent, appeared to really let their hair down as they chatted away at the bar before the Mother Monster took to the stage.
Benedict, 37, who has been linked to a number of women over the last couple of months, clearly has become a fan of hat wearing since starring as Sherlock Holmes.
Slipping on a baker boy style cap the famous red-head dressed down in a pair brown trousers with a black zip up cardigan and casual trainers – looking a far cry from the dapper appearances he puts on at events.
Laura meanwhile also looked vastly different to her on stage character Lady Edith – showing off a more relaxed style.
The pretty actress wore a pair of dark blue jeans with a white T-shirt and leather jacket, while her hair was worn loose.
Laura and Benedict clearly get along like a house on fire and they were seen laughing away together as they hung around the bar enjoying a few drinks.
Benedict seemed in a particularly good mood and messed around talking selfies of himself and a friend as Laura stood about laughing.
The Star Trek actor is currently believed to be single. For 12 years, he was in an on-off relationship with actress Olivia Poulet, best known for her role as Tory spin doctor Emma Messinger in BBC sitcom The Thick Of It.
Since the break-up, he has been linked with several high-profile women, including Star Trek co-star Alice Eve and Lord Of The Rings actress Liv Tyler.
More recently, he has dated furniture designer Anna Jones, rekindled an old friendship with Russian model and actress Katia Elizarova and has been linked to Charlotte Asprey are leaving a club hand-in-hand with her.
Meanwhile little is known about Laura’s love life.
Gaga was headlining the first night of the month-long iTunes Festival at the famous Camden venue.
The New Yorker opted not to play some of her more well-known songs, in favour of debuting a number of her new tracks from her forthcoming third album Artpop.
But while some of her songs may not have been so well-known her kooky looks were certainly familiar amongst fans.
The 27-year-old singer started her set in ninja-inspired ensemble before switching into a shell bikini top and seaweed encrusted thong- which gave her the chance to show of her derriere.
Die hard fans made themselves known outside the venue, dressing up in typical Gaga fashion, taking inspiration from the singer's most famous get-ups.
And to celebrate her new song Swine, many fans donned pig noses and held up signs that said '#swinefest2013'.
However while Laura and Benedict are clearly fans, having got their hands on the sought-after tickets, they chose not to dress up for the occasion.