To promote "Un Momento", an accompanying music video was shot by Alex Herron in late July 2011 and uploaded onto Inna's YouTube channel on 9 August 2011 to positive responses.

In June 2010, Inna announced via her official website that two new songs, "Un Momento", in collaboration with Spanish singer Juan Magán, and "Sun Is Up", would be featured on an upcoming "Summer Hit Pack".

[4] With the plans remaining unmaterialized, the singer later confirmed that "Un Momento" would be included as a bonus track on the Spanish edition of her debut studio album Hot (2009), which was ultimately released on 28 September 2010 in that region.

[8] It was written and produced by Romanian trio Play & Win members Sebastian Barac, Radu Bolfea and Marcel Botezan, along with additional production from Magán.

Anna Julia Höhr, writing for the news agency Teleschau, commended "Un Momento" along with "Déjà Vu" (2009) and "Inna Mega Mix" from the German edition of I Am the Club Rocker.

[20][21] An accompanying music video for "Un Momento" was shot by Alex Herron in late July 2011 — with whom Inna had previously collaborated on her "Sun Is Up" (2010) and "Club Rocker" visuals — in Palma de Mallorca, Spain, with Martin Coppen acting as the director of photography.

As the clip, progresses, they are seen walking on the roads of Palma de Mallorca and interacting with people, riding bikes, residing on a yacht, taking photos, watching someone getting a tattoo reading "CLUB ROCKER", and making appearance at a party at night.

"[7] Pure Charts's Hamard pointed out "yacht, sun, beach, pool and sexy look" as the video's "ingredients", positively comparing it to her previous material.