"My Valentine. Happy Valentine's Day!" Daniel, 33, captioned a selfie photo with Britt on Tuesday, February 14.
In the photo, Britt, 33, had her arms wrapped around Daniel's neck, and they were both smiling.
And Britt uploaded a Valentine's Day post of her own via Instagram, a video of the couple dancing and goofing around. The video was set to "Fall in Love with You" by Montell Fish, and she captioned it with a red-heart emoji.
Congratulatory messages poured in from the Dancing with the Stars family, some of whom suggested they had an inkling during the season that a love connection between Britt and Daniel was forming.
Pasha Pashkov chimed in with the following comment: "Happy Valentine's Day you lovebirds!!!"
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And Koko Iwasaki commented, "You already know how I feeeeeeeellllll."
Daniel, who is deaf, gushed toUs Weekly late last year how Britt was studying and rapidly picking up American Sign Language as they rehearsed together for Dancing with the Stars.
"She knows how to sign, she's learning how to sign," Daniel shared in September.
"Before, my interpreter... he'd be there interpreting for us at practice, and now he fades away during practice and it's nice. She understands me."
The Switched at Birth alum added of Britt, "She's such a brilliant woman and she shows me her skills and it's amazing. And she looked at me and I feel like I knew she could teach me."
Britt also boasted about Daniel's "story, passion and heart" at the time.
Britt and Daniel have posted many photos with each other on social media since their Dancing with the Stars stint, but Valentine's Day marked the first time they revealed their relationship is a romantic one.