The singer is currently preparing to release her new single 'Marry The Night' as the fifth cut to be lifted from her Born This Way album.
The star wrote on Twitter: "This will be the longest video I've released to date. The beginning of the story I never told you."
GaGa has also revealed plans to release a teaser of the impending video later this week, following her performance at the Children in Need concert.
"Because you have all been SO supportive of MARRY THE NIGHT and all my performances, I've decided to release an early treat," she explained.
"The 17th, after my UK performance on Children in Need, I'll tweet the opening of my new video. "MARRY THE NIGHT: THE PRELUDE PATHÉTIQUE.""
Lady GaGa will perform alongside JLS, Elbow, James Morrison, Coldplay and Ed Sheeran for Children in Need at the MEN Arena in Manchester on November 17.
GaGa's longest video to date is Beyoncé hook-up 'Telephone', which comes in at 9 minutes, 31 seconds.
> Lady GaGa releases 'Marry The Night' music video preview picture
Listen to Lady GaGa's 'Marry The Night' below: