Dunham's 66-page proposal was enough to land a $3.7m book deal with Random House after a bidding war.
Gawker writer John Cook posted the leaked proposal on the site four days ago, with a scathing commentary on the content which Cook describes as the work of "a girl who is lost in her own mind".
Gawker has since taken down the report from the site after being contacted by Dunham's lawyer, reports Deadline.
Buzzfeed has also followed suit, taking down the images from a post entitled '9 Passages From Lena Dunham's Book Proposal Illustrated By Her Instagrams'.
However, Cook has retained quotes from the proposal in his original post, and has added more commentary "clarifying intent in quoting the above matter from Dunham's proposal".
One piece of 'commentary' reads: "The quoted sentence demonstrates that Dunham is incapable of conceiving a rationale for writing that doesn't serve the goal of drawing attention to herself."
HBO is reportedly close to picking up the 26-year-old writer and actor's sitcom Girls for a third season. The second season is set to premiere on HBO in the US on January 13, and on Sky Atlantic in the UK one day later.
Watch the trailer for season two of Girls below: