August 29, 2015 8:21 AM EDT

A quick scroll through Robert Downey Jr.‘s Instagram and it’s clear to see why his wife fell in love with him: his great sense of humor.

But in his latest post, the Iron Man actor, 50, put all jokes aside, taking on a more earnest tone to share just how much he loves his wife in return.

To celebrate his 10th anniversary with wife Susan Downey, the actor posted a cute photo of the two wearing matching black shirts and sunglasses on the beach.

Referring to both his wife’s undeniable beauty and the number of years they have been married, he captioned the photo, “A perfect 10. Happy Anniversary, Mrs. Downey.”

It’s clearly been a great year for the couple, who welcomed a daughter together in November.

“Yep … Avri Roel Downey joined the party @ 3:22 a.m. on November 4th … she’s 7 lbs even, spans 20 inches, and is accompanied by a variety of Susan’s traits that have seemingly overwritten my ‘junk DNA,’ ” Downey wrote onFacebook the day after his daughter’s birth.

Read next: Robert Downey Jr. Walks Out of Interview After Questions Turn Personal

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