(CNN) -- Jessica Simpson and Dolly Parton have found more to bond over than their blonde locks and country crooning. The famously busty pair found common ground this week over the difficulties of having an ample bosom.

"Aahhh chiropractor... Hurts so good :-) you lug these around and see if your back don't hurt!" Parton, 63, posted to her Twitter account Monday morning.

Simpson, 29, a longtime fan of Parton's, responded to the tweet with an "Amen sister :)."

Both Simpson's and Parton's double-D breasts have been topics of discussion over the course of their careers. Jessica Simpson's father, Joe, famously praised his daughter's chest in a 2004 interview with GQ magazine.

"Jessica never tries to be sexy. She just is sexy. If you put her in a T-shirt or you put her in a bustier, she's sexy in both. She's got double D's! You can't cover those suckers up!" Joe Simpson said.

When Simpson made her country debut at the Grand Ole Opry last year, she offended some of her new fan base by showing off too much cleavage.

One fan went so far as to complain to People magazine, "I think she should have put some clothes on."

After spending decades more than Simpson in the spotlight, Parton has always joked that she believes her breasts became more famous than she is.

"My breasts have served me well. I don't know if I'm supporting them or they're supporting me. But of course I've had them jacked up a bit. And they're part of the persona. It always takes a bit of pressure off me," Parton said last year.

This week isn't the first time the "9 to 5" singer has publicly complained about her ample assets.

"My boobs are killing me, and I don't know if I can stand the pain any longer. They have been a trademark for me, but I've paid one hell of a price," Parton moaned in 2004.