Sarah Hyland took to social media this week to wish a happy 18th birthday to her Modern Family costar Ariel Winter.

“Happy 18th birthday @arielwinter!!!!! It blows my mind that you’re now the age I was when we first met. Love you little sister ???,” Sarah Hyland captioned a photo of the girls together.

A photo posted by Sarah Hyland (@therealsarahhyland) on Jan 28, 2016 at 12:20pm PST

Ariel Winter had to work on her birthday, but Sarah Hyland, Sofia Vergara, and more of the Modern Family cast made sure she had a celebration on set.

Happy bday @arielwinter ??????

A photo posted by Sofia Vergara (@sofiavergara) on Jan 28, 2016 at 2:11pm PST

Sarah Hyland made sure to draw attention to Ariel Winter’s 18th birthday via Twitter, too.

Happy 18th birthday @arielwinter1!!!!! It blows my mind that you're now the age I was when we… https://t.co/2tGW8uMa2S

— Sarah Hyland (@Sarah_Hyland) January 28, 2016

Ariel Winter and Sarah Hyland are as close as sisters, and that’s no wonder. The two have played sisters on Modern Family since it first aired in 2009. Sarah Hyland plays the role of Haley Dunphy, with Ariel Winter in the role of Alex Dunphy.

Even though Ariel Winter had to work on her birthday, her Modern Family family members Sarah Hyland, Sofia Vergara, and more made sure they stopped to celebrate the momentous occasion–if only for a little while.