Conjoined twinsAbby and Brittany Hensel have been spotted out and about with a sweet newborn baby, leading to speculation that their family might have grown.

In pictures shared by TMZ, the 35-year-old twin sisters, whose TLC series Abby & Brittany ended more than a decade ago, were seen carrying the adorable infant in a car seat before carefully making sure the baby was secured inside the back seat of their vehicle.

The sisters then spent some time at the boot of the black Tesla before heading off on their journey and leaving the car park in Arden Hills, Minnesota. But they aren't the only TV stars who have gone through a major change, with the sighting coming after one huge TV star looks completely unrecognisable as she reveals latest facelift.

Abby, who married husband Josh Bowling back in 2021, is already a step-mother to his daughter Isabella, from a previous romance - but for a long time, the sisters have always expressed a desire to have children.

READ MORE: Junior Andre's girlfriend Jasmine sobbed over Katie Price comparisons

READ MORE: Richard Osman reveals axed Ant and Dec show was 'expensive car crash'

"We're going to be moms," Brittany said in Joined for Life: Abby & Brittany Turn 16 in 2006. "We haven't thought about how being moms is going to work yet."

Abby and Brittany are dicephalic parapagus twins, which means they share one torso to which their two heads are joined, and they also share one pair of legs.

Abby, who is on the right side of the body, controls the right arm and leg, and Brittany has control over the left limbs. Conjoined twins are very rare, but the Hensen sisters are even more unusual because they are really pretty symmetrical compared to other conjoined twins.

They have always been really candid about their unique shared lives, and recently posted a video on their TikTok page, which saw a doctor explain how their joined anatomy actually works.

"Abby and Brittany Hensel's anatomy is a remarkable blend of shared and individual organs and tissues," the video they shared by molecular biologist Hashem Al-Ghaili explained, "The twins each have their own distinct upper body systems. Abby and Brittany have two heads, two brains, two spinal cords, and two hearts, which are part of a shared circulatory system."

Despite having the same blood circulation system, their brains and spinal cords are their own, which means they have to work in tight-knit coordination to carry things, get places, or drive a car.

The pair previously opened up on their reality TV show for TLC just how painstaking the coordination has to be on a minute-by-minute basis.

"We have two licenses," Abby said back in 2012, "When we got our driver's licenses, we each had to take the test. We both passed."

Brittany explained that they both have to steer, but her sister was the one in charge of the brake and acceleration pedals.

Despite having their own hearts, brains, spines, and four lungs, the sisters share one set of reproductive organs.

They haven't confirmed whether the baby they were spotted with is their own, and the teacher sisters now stay mostly out of the spotlight.

When they were children, their parents were offered the possibility of separation surgery, but they turned it down, because it was unlikely that both their daughters would have survived.

READ MORE: Rare luxury watches made out of rubbish shoppers 'couldn't be happier with'