The Leftovers star posted a photo overnight showing gorgeous Jen from behind, giving users a beautiful view of her Valentino gown.
He kept the caption simple, saying: "#wcw #valentinored #xo."
The image of Jennifer was taken at the Oscars back in 2013, where she wowed in the strapless red Valentino creation. Beautiful!
Justin and former Friends star Jennifer married at a private ceremony held at their Beverley Hills mansion in August. Guests included Courteney Cox, Lisa Kudrow, Chelsea Handler and Ellen DeGeneres.
They'd been engaged since August 2012.
Justin launched his Instagram account just week ago and yesterday's image of Jennifer was his first reference to his famous wife. We hope there are many more to come!
We wonder if he can convince Jen to start her own Instagram? Perhaps not as earlier this year she said social media just wasn't for her after she tried running her company Living Proof's Instagram for a week.
She told People: "I was so stressed out, sweating bullets. It was too much pressure. For these Kardashians, it's a career!"
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