Stop the celebrity weight loss presses.

Alleged singer Jessica Simpson - who has been battling scrutiny for her new curves (and mom jeans, and gigantic booty) so far this year - is back working out.

And she's not a fan.

"On my way to work out with my trainer," she wrote on her Twitter page. "Every time we have to do squats, he yells at me, 'Get lower like you're in the club!'"

Jessica's reply: "I don't squat in the club unless I am peeing!"

This is a fake picture of Jessica Simpson, but a good one.

A source says Simpson, who fancies herself as a sunset, is working with her longtime Mike Alexander, who told Fox last month that the singer wasn't miffed at all the coverage surrounding her fuller figure. Any PR is good PR, right?

"The whole thing wasn't as traumatic for Jessica as everyone made it out to be," he said. "She's a confident and naturally beautiful girl who works hard."

Amen. Follow the jump for a photo progression of Jessica Simpson's weight gain over the years (these pictures are actually real this time, too) ...

PAST HER PRIME: As you can see, it's been a slow and steady decline for this once-shining star. And we're not just talking about record sales, people.