Yellowstone’s Hassie Harrison Celebrates Her ‘Sweet Cowboy’ Ryan Bingham in Loving Tribute for His 43rd Birthday

Hassie Harrison is celebrating her on and off-screen love Ryan Bingham on his special day.

The Yellowstone actress, 34, shared a sweet tribute to Bingham — who plays her love interest Walker on the hit Paramount Network series — in honor of his 43rd birthday on March 31.

“happy birthday to my sweet, sweet cowboy,” she wrote on Instagram alongside the couple pressing their noses together. “let’s keep adventuring, dreaming and giggling all night together…you know, best friend stuffs ✨🎂🥳”

The pair became Instagram official nearly a year ago with Bingham sharing a photo of him and Harrison kissing in front of a huge bonfire, the flames burning high over their heads.

“More than a spark 🔥,” the actor and musician captioned the fiery photo to his 745,000 followers, tagging Harrison.

“I love you, cowboy. 🥰” Harrison replied in the comments.

The duo sported blue jeans, camo jackets and rubber boots in the outdoorsy shot.

Since their debut, the couple has shared several glimpses of their romance.

In May, Harrison posted a photo of the pair at country music festival Stagecoach, where Bingham, a Grammy-winning musician, performed. In July, the singer-songwriter shared a cute snap of the couple at a Colter Wall concert.

Also in July, Harrison shared a sweet pic of herself and Bingham clad in swimsuits, alongside which she wrote, “Highly recommend taking your cowboy to the beach.”

In November, the couple sparked marriage rumors after they were spotted wearing what appeared to be wedding rings.

In a clip that Bingham and his bourbon brand, Bingham’s Bourbon, posted on Instagram on Nov. 30, the actor-singer showed off a wedding-like ring (a simple gold band on his left ring finger) as he held a bottle of bourbon.

The following month, a video — shared by Cowboys & Indians Magazine — of the costars-turned-partners at the first day of the National Finals Rodeo in Las Vegas showed Harrison sporting a ring on the same finger.

In the comments sections of both posts, Yellowstone fans speculated that the couple has secretly gotten hitched, writing things including, “Why are you flashing that ring,” and “Ummmm, is that a wedding ring?! How did I not hear this?”

Bingham — a Grammy-winning musician, who has released six studio albums to date — has three children with his ex-wife Anna Axster, who he was married to for 12 years until 2021. Harrison previously dated One Tree Hill alum Austin Nichols until 2020.

Never miss a story — sign up for PEOPLE’s free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.

Yellowstone is now streaming on Peacock.