Hilary & Haylie Duff Pose with Their Daughters in Sweet Photo!

Hilary and Haylie Duff‘s daughters are on the fast track to being BFFs!

Haylie took to Instagram on Thursday (March 21) to share a photo of herself and daughter Lulu along with sister Hilary and her daughter Banks as they celebrated Hilary‘s son Luca‘s 7th birthday.

“Thank you @sharm1222 for remembering to snap a pic of US! @hilaryduff and I always take so many pics of our kids that we never seem to be in them together! 🥰 Yesterday we had the best evening! Celebrating the first baby to join our family- our big boy, Luca!! I can’t believe he’s already so big. So proud of him!” Haylie captioned the below shot.

Hilary and boyfriend Matthew Koma welcomed daughter Banks in back in October while Haylie and husband Matt Rosenberg welcomed Lulu last June.

Check out the sweet photo below!

Also pictured inside: Hilary Duff stepping out to run a few errands ahead of Luca‘s birthday party on Wednesday (March 20) in Los Angeles.