The actress captioned the picture, “Another birthday!! #eek But I think I'm younger than this #vintagestroller??🙏 Not quite sure what's happening here... #eek #70's #photoop#oldschool #raisedbyartists.”
Her former partner saw the snap and quickly commented “Happy Birthday Sweetheart.”
The 48-year-old actor made the surprising move only 3 days after he and Watts, 47 confirmed their separation to ET.
"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. 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," the couple said in their statement.
"While we appreciate your curiosity and support, we ask the press to be mindful of our children and respect their right to privacy."
The couple, who never married, have been together since 2005 and have two children together, Alexander, 9, and Samuel, 7.
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