Amanda Bynes tweets shirtless selfie

Almost a month after Amanda Bynes opened up about her eating disorder, the former Nickelodeon starlet posted a couple of shirtless pictures of herself on Twitter to showcase her claim that she needs to lose weight.

"About to put on makeup! I weigh 135, I've gained weight! I need to be 100 lbs!" Bynes tweeted on Monday.

The 5"8 tall Bynes' reported a weight of 135 pounds, within the "medium frame" range for a woman her height, according to a weight chart from Healthy Check Systems. However, this might not seem like enough to Bynes who has expressed her struggles with staying thin in the past.

On February she told Us Weekly that she gained weight quickly and needed to work out constantly, adding that her goal weight is 100 pounds.

A couple of months later the actress confessed on Twitter she had a hard time staying thin because of her eating disorder.

"I have an eating disorder so I have a hard time staying thin," Bynes wrote on April 4th.