The flamboyant Ranveer Singh and the beautiful Alia Bhatt, fresh from their respective vacations came together to launch the trailer of their upcoming flick `Gully Boy`. The grand event was held in mumbai and was attended by film`s director, Zoya Akhtar, Producers Farhan Akhtar and Riteish Sidhwani. The film also has Kalki Koechlin. The film is about the journey of an underdog young rapper who rises from the streets of Mumbai going on to become India`s one of the most notable rap talents. Gully Boy is loosely based on the life of Indian rapper Divine, who is known for songs like Meri Gully and Roots. Alia and Kalki Koechlin, play contrasting love interests. While Alia will be seen playing a lively young girl from a background similar to that of Ranveer`s character in the film. Kalki will portray the success he aspires to. The film is produced by Excel Entertainment. The film is set to release on Valentine`s day in February.