"Happy Birthday to this one!!" Watts wrote, captioning an adorable photo of Schreiber with their two sons.
Watts took to Instagram to wish her ex a happy birthday just over a week after the former couple announced their decision to separate after 11 years together.
“Happy Birthday to this one!!” she wrote, captioning an adorable photo of Schreiber with their two kids.
Watts, who turned 48 last Wednesday, celebrated her own birthday on Instagram as well, posting a throwback photo of herself as a toddler.
“Another birthday!! #eek But I think I’m younger than this #vintagestroller??” she wrote. “Not quite sure what’s happening here…#eek #70’s #photoop #oldschool #raisedbyartists.”
Shortly after Watts shared the photo, Schreiber left a heartfelt comment on the post, writing, “Happy Birthday Sweetheart.”
The former couple announced the end of their 11-year relationship on Monday. The actors’ sweet birthday messages to one another further validates the statement they released after their split, in which they vowed to remain friends.
“Over the past few months we’ve come to the conclusion that the best way forward for us as a family is to separate as a couple,” Schreiber and Watts said in a joint statement to PEOPLE.
RELATED VIDEO: Liev Schreiber Shares Sweet Moment Getting Ready for the Emmys
“It is with great love, respect, and friendship in our hearts that we look forward to raising our children together and exploring this new phase of our relationship While we appreciate your curiosity and support, we ask the press to be mindful of our children and respect their right to privacy,” the statement continued.
The two are parents to Alexander (Sasha) Pete Schreiber, 8, and Samuel Kai Schreiber, 7.