jessica simpson

Ouch!

Jessica Simpson says she's in pain after working out with trainer Mike Alexander.

"Why am I still hurting from our workout earlier? I'm getting old!" the 29-year-old posted on Twitter Wednesday.

See how Jessica Simpson's body has changed over the years

That doesn't mean she's quitting the gym.

"See you tomorrow with a pouty face and sore buns," adds Simpson, who will star next year in a VH1 reality show, "The Price of Beauty."

See photos of Simpson working out

Simpson -- who has admitted to wearing butt pads -- has been criticized for her changing curves.

"I will never understand why people attack for a laugh," she has said. "Own your beauty and don't listen to the judgement [sic]."

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