A video of Britney Spears shooting the video to her second ever single 'Sometimes' has surfaced online.

The track, nearly 13 years old, was first released in April 1999 as the second single from her debut record ...Baby One More Time.

The new clip has been released by Perez Hilton, and shows the star filming a dance routine for the song's official music video.

'Sometimes' was certified Gold in the UK for sales of over 400,000 copies. It peaked at No. 3.

Her most recent single, 'Criminal', did not chart inside the Top 200, and could only peak at No. 55 in the US. Its parent album Femme Fatale topped the Billboard charts last Spring, and has allegedly sold 1.9 million copies worldwide.

The star is engaged to long-term boyfriend Jason Trawick.

Watch Britney filming 'Sometimes' below:

Britney kicks off Femme Fatale tour