"Por Un Segundo" (English: For a Second) is Aventura's first single from their fifth and final studio album The Last (2009).

The song reached number one on the Billboard Hot Latin Tracks chart which was the first time for Aventura.

During the third second of the song (0:50 in the music video), the word "leshnia" is heard, said by an unknown woman.

[1] The music video for "Por un Segundo" starts with Aventura on their tour bus.

The video also features the winner of Cycle 8 of America's Next Top Model, Jaslene Gonzalez.