Tweet revenge: Britney Spears puckers up and Lady Gaga gets set for pillow fight

Re-enactment: Britney Spears duplicates her 2003 Madonna video in Glee

11 April 2012

Britney Spears and Lady Gaga are having a "tweet war" to become the most popular musician online.

Lady Gaga, 24, has been closing in on Britney, 28, and is now within 4,000 followers.

Last night Britney posted pictures on Twitter of her cameo role in the popular US musical series Glee in which she recreates a steamy scene she first acted out with Madonna in their 2003 video Me Against The Music.

Lady Gaga replied with a picture of herself tucked up in bed in an attempt to woo more followers.

Britney has 5,659,908 followers, while Lady Gaga has 5,655,633 and is expected to take the lead today.

But experts say teen sensation Justin Bieber, on 4,627,213 followers, is gaining popularity fast and is predicted to be the most popular tweeter by the end of the year.