Carefree Jennifer Lopez poses in bathtub days ahead of 57th birthday

Jenny from the block is in the bathtub.

On Sunday, Jennifer Lopez posted a carefree picture of herself sans clothes and enjoying what appeared to be dessert with her sister, Lynda Lopez.

The singer, 56, was all smiles in a marble tub, while Lynda, 55, grinned from the floor.

“A double birthday sister trip is always a good idea!!” Jennifer captioned this weekend’s upload, which she shared shortly ahead of turning 57 on Friday.

“I love you Lynnie!!” the Grammy nominee continued. “Happy birthday!!”

The carousel included other sweet sibling moments from their Paris vacation, from blowing out candles at a restaurant to simply chatting.

Lynda posted about the France getaway herself via Instagram Stories on Sunday, dubbing it “the best double birthday sister trip [she] could have dreamed of.”

She went on to thank Jennifer before highlighting the bathtub shot, which was a “peak” moment of the trip.

When the “Office Romance” actress turned 56 last year, she honored the milestone with an over-the-top party in Turkey.

She was on tour at the time and debuted her “Birthday” song earlier that evening.

“Name on top of the cake, it’s my birthday / I’ma make this famous ass shake, it’s my birthday,” the actress sang at the time. “Throwin’ all this money in they face, it’s my birthday / Every day is my birthday, bitch.”

Six months later, Jennifer acknowledged “some of the things” social media users say about “dress[ing] her age” — and issued an epic clapback.

“I do laugh at [the comments],” she said during a January show as part of her Las Vegas residency. “Why is she always dressed that way? … Why’s she always naked?

“If you had this booty, you’d be naked too!” the dancer continued with a shimmy.

Jennifer, who was in a barely-there fringe ensemble at the time, frequently flaunts her killer physique in bikinis, red carpet gowns and more.