Stefani, 49, took to Instagram Thursday to share a Photoshopped picture of herself and Shelton, now 42, as young adults.
In the photo, Shelton appears to have his arm around Stefani, who is wearing white gloves, a red t-shirt and lipstick.
“If only it were true,” one fan commented in response.
“Priceless,” another wrote.
“Cool pic. I love photoshop,” a third added.
On Valentine’s Day, Stefani paid a sweet tribute to Shelton, calling him her “favorite guy.”
The two first made their public debut as a couple in 2016, according to Billboard. And they haven’t been shy about their romance since. In fact, Stefani told ABC News’ “Good Morning America” in June that the singer “changed [her] life.”
"He's my homeboy. He's my homey. He's just really an amazing all-around human so I feel so grateful for that," she added at the time.