Washington, July 5 -- Actress Julia Roberts and cinematographer Danny Moder marked 23 years of marriage with a private camping retreat, as revealed in heartfelt social media posts.

Roberts posted a photo on Instagram showing the couple's bare feet inside an open tent overlooking a scenic forest and lake.

The caption read, "You + Me = 23," referencing their wedding anniversary, which falls on US Independence Day, July 4.

Moder added his own light-hearted contribution to the celebration, sharing a photo of a silver spoon engraved in honour of the milestone.

"23 years is SILVER," he wrote, adding, "Here we are in my engraved SPOON! the fun continues... and a happy 4th to all."

The couple, who met on the set of 'The Mexican' in 2001 and ...