Downton Abbey star Michelle Dockery looked a far cry from her on-screen alter ego, Lady Mary Crawley, as she and her co-star Michael Fox made their music debut on Monday night.MORE: Downton Abbey's Michelle Dockery teases new chapter for sisters Lady Mary and EdithThe two stars, who have formed a folk duo, performed their first live show at an intimate gig held at the Omeara London, which was attended by the likes of Dermot O'Leary.WATCH: Downton cast reminisce on 12 years in the franchiseDressed casually in black jeans and a coordinating sleeveless top and white jacket, the actress sang a series of songs whilst playing the guitar.MORE: Michelle Dockery reveals the 'downside' to filming Downton AbbeyREAD: Downton Abbey's Elizabeth McGovern on watching on-screen daughters 'grow with confidence'Michael, who plays footman Andrew Parker in the Downton franchise, opted for dark trousers and a blue shirt worn over a white T-shirt.The stars first met on the set of the period drama Downton Abbey, and soon discovered their shared passion for music. They quickly started to play music together in between shooting scenes.