The official Instagram account of the actress' team shared the picture wherein Kangana and Rajkumar could be seen giving a romantic pose.
The caption reads, "Going #Mental on the streets of London #KanganaRanaut & @rajkummar_rao paint the town crazy at the wrap party up for the #MentalHaiKya shooting schedule in London. @balajimotionpictures @ektaravikapoor @pkovelamudi #ShootDiaries @karmamediaent."
She also posted photos with the crew members of Mental Hai Kya.
The thriller, which is Rao and Kangana's second project together after 'Queen', is produced by Ekta Kapoor and Shailesh R Singh.
Directed by Prakash Kovelamudi, the film also features Amyra Dastur and Satish Kaushik.
Recently, Kangana and Rajkummar announced the release date of the film in a hilarious video.
The flick is all set to hit big screens on February 22, 2019.