A sonogram image that appears to show a pair of twins sharing a kiss inside the womb is melting their parents’ hearts.

The moment was photographed during first-time mom Carissa Gill’s 24-week ultrasound.

“In the 2-D ultrasound that I see in the doctor’s office, they’re never that close together — just seeing them face to face, it was a big shock,” Gill told ABC News. “You can see their mouths open and closing. It started when Bella was kissing Callie’s cheek. Two weeks before that they were kicking each other.”

Gill 22, had the ultrasound done on April 4 at Fetal Vision Imaging in Levittown, Pennsylvania.

“Congratulations Carissa and Randy with your kissing twins!” the company wrote on Instagram. “Thank you for coming to Fetal Vision, we hope you enjoyed your experience with us!”

The facility offers parents an opportunity to see their baby in 3-D or 4-D.

Carissa Gill/Fetal Vision Imaging

“Seeing that ultrasound like that was priceless to me,” dad Randy Good told ABC News.

Watch a sweet video of the twins and find out what Carissa and Randy are naming them at ABC News.