Ryan Phillippe and Reese Witherspoon made a rare appearance together to celebrate their son's 18th birthday

• Ryan Phillippe and Reese Witherspoon made a rare social-media appearance together on Saturday.
• The famous exes were celebrating their son Deacon's 18th birthday.

Exes Reese Witherspoon and Ryan Phillippe made a rare social-media appearance together to celebrate their son Deacon's birthday.

On Saturday, Phillippe shared an Instagram photo of himself with Witherspoon and Deacon for Deacon's 18th birthday.

"You are a true light in this world and are so loved by all who know you. We are lucky to be your mom and dad," Phillippe wrote.

"I'd say we did pretty good," he added, tagging Witherspoon.

Witherspoon commented on Phillippe's post saying she was "so proud of" Deacon. The "Morning Show" actress separately shared photos of her son on her own Instagram page to mark his birthday over the weekend.

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Some of Phillippe's one million Instagram followers also commented on Deacon's striking resemblance to his famous parents.

"I really don't know who he looks like more," one Instagram user wrote.

Strong genes clearly run in the family. Witherspoon and Phillippe's 22-year-old daughter, Ava, is also a spitting image of her parents.

When Ava appeared in a 2018 social-media campaign for her mother's lifestyle brand Draper James, some Instagram users wrote that she was "mini-Witherspoon," while some others said she was "the perfect combination of her mother and dad."

Witherspoon and Phillippe were married for nine years from 1999 to 2008 and starred as love interests in the popular thriller "Cruel Intentions" (released the same year the couple got married).

The exes previously reunited in October 2020 to celebrate Deacon's 17th birthday.