Justin Long Calls Kate Bosworth His "Best Friend" in Romantic Birthday Tribute

Justin Long is letting his followers in on his love story with Kate Bosworth. The actor shared a heartfelt tribute in honor of Bosworth's 40th birthday on Jan. 2, writing, "She is 40!" In an Instagram carousel, Long shared various photos of the two of them together, embracing under the sunset, sharing pastries, and laughing hysterically. "She is also the best part of my day, everyday — even when we're not together," he wrote.

Long added: "She sees beauty everywhere and in everyone. She thanks everyone — even when she's suffering, she's kind. She was grateful to the nurses while she was in true pain. She is deeply compassionate and can't hurt anyone but she can be a rascal. She loves to tease."

Turning the romance up a notch, Long went on to describe specific details he loves and admires about Bosworth: "She has the best softest lips I've ever kissed. She loves beer and football more than I do (and I love beer and football). She is the strongest person I've ever known. She's fiercely committed to the truth. She's so fun to work with. She's the most fun to do everything with. She is genuinely curious about people and the world."

Adding to the list, Long said, "She will do anything for her friends. She is so generous she makes my parents slightly uncomfortable around the holidays (she also makes the best cookies)," which is arguably one of the best qualities any person can have. "She is sitting next to me writing her own Instagram post that I know will be eloquent and funny and deeply honest — because she is all those things," he wrote.

"She makes everything in my life better — all my favorite songs and movies, vacations and sunsets and Chinese food," Long noted. "She strives to be better but she's the best person I know." Someone please pass the tissues. "She is my joy. She is my best friend."

Bosworth went on to post an Instagram of her own, expressing her love and gratitude. "You are my love and my light, my peace and my thrill," she captioned a series of photos of the pair. "Thank you for holding my hand when we sleep. Thank you for tying my shoelaces when you notice they are undone. Thank you for making me laugh so hard I have to leave the room. Thank you for showing me what love is and for making this the best birthday ever."

Bosworth first posted about Long in May 2021, after the two wrapped up an unnamed project in Arkansas. Bosworth called Long a "truly spectacular / fun / funny / kind / rare / thoughtful / totally. fckn. rad human being." It wasn't until later that year, however, that the two were officially suspected to be dating.

Long later confirmed he was in a relationship in a December episode of his "Life Is Short With Justin Long" podcast, but he didn't name names. According to People, the two were first spotted together in March 2022, and the following month, they were seen kissing on a beach in Hawaii. Then, in May 2022, Long made it Instagram official, posting a photo of his matching beer-foam mustache with Bosworth, who commented, "I'm the luckiest."