Gwen Stefani pulled off a huge surprise Friday night by appearing onstage with Blake Shelton at his California concert!

Shelton held a concert at The Forum in Inglewood, Calif. Friday night, but fans certainly didn't know they would be seeing another music superstar. Stefani, who is currently dating Shelton, came onstage to a roaring crowd and performed their duet song, "Go Ahead and Break My Heart". As seen in this Instagram video from The Forum, they couldn't keep their eyes off each other:

 SURPRISE! Gwen Stefani + Blake Shelton duet! (See more on Snap! : theforum) #BlakeForum

A post shared by The Forum (@theforum) on Feb 17, 2017 at 11:36pm PST

Shelton and Stefani began dating in late 2015, shortly after their respective divorces from Miranda Lambert and Gavin Rossdale. The pair worked together as coaches on The Voice, and will be seen together again in the upcoming 12th season. Adam Levine and Alicia Keys are the other coaches.

The couple has been enjoying each other's company lately. In December, Shelton spoke about how Stefani took him to Disneyland and her hometown.

"She drove me down the street to the house she grew up in and then the house that they used where they basically created No Doubt and wrote a lot of the songs and rehearsed everyday on Beacon Street down there," he said on Jimmy Kimmel Live.

"The houses ... they've been sold and bought or whatever, so if you look out your window and Gwen Stefani is standing in your lawn taking selfies - and this happened, I was down there just a couple months ago," he continued. "She was like, 'Oh my god, there's my house.' She jumps out of the car and is standing in these random people's lawn. They may not even know they live in the house she grew up in, you know, and she's taking selfies in front of it. It was cool."

The Voice season 12 premieres Monday, Feb. 27 at 8 p.m. ET/PT on NBC.

Tags: Gwen Stefani Blake Shelton