Sarah first said, "I love you," when she posted a collage photo on Instagram of the couple dressed in formal black-and-white attire as well as colorful and somewhat tacky Christmas clothing.
"Merry Christmas Eve from two people who go to the Ballet in Black Tie Attire and who go to the mall in ridiculously cheesy Xmas sweaters and hats on the same day. I love you @wellsadams," Sarah, 27, captioned the December 24 image.
Wells, 33, then replied in her Instagram comments, "I love you more @sarahhyland," to which the Modern Family actress quipped: "Nope."
Ever since going public with their relationship in October by attending Halloween parties together, Sarah and the Bachelor in Paradise alum have appeared inseparable. Wells and Sarah also never shy away from public displays of affection on social media.
"They have been dating a while now," a source toldUs Weekly in November 2017 of the couple. "It is getting more serious as time passes. They really like each other."
Sarah split from her ex-boyfriend, actor Dominic Sherwood, in August after dating for two years. As for Wells, the radio personality was most recently linked to Danielle Maltby from Bachelor in Paradise 4.
Despite sharing a steamy kiss with Wells in Mexico this past summer, Danielle insisted to Us that she's thrilled about Wells' new romance.
"Of course we are [still friends]. I'm so happy for him," Danielle gushed in early December. "I've met Sarah. Sarah is amazing."
Danielle elaborated: "They bounce off of each other so well, like they really bring out the best of each other. Like they're both so funny and amp each other up so much. And the smile that Wells gets on his face is unreal. It's so cute. It really is so cute."
Prior to his two back-to-back Bachelor in Paradise appearances, Wells competed for JoJo Fletcher's heart on The Bachelorette's twelfth season in 2016.