By Dacy Knight
Updated Aug 21, 2016 @ 3:00 pm
Blake Shelton and Gwen Stefani LEAD
Credit: Kevin Mazur/Getty

Doting boyfriend Blake Shelton was the biggest cheerleader for Gwen Stefani as she took the stage Saturday night to perform. The lovebirds joined a bevy of other celebrities at the Apollo in the Hamptons charity event in East Hampton. The fundraiser was held to raise funds for education and mentoring programs for youth at the historic Harlem theater.

Before rocking out as Stefani performed her hits like "Hollaback Girl" with Pharrell Williams and "Don't Speak," the country music star surprised everyone in attendance by joining his ladylove onstage. The couple performed the duet they co-wrote, "Go Ahead and Break My Heart," to open the pop star's set.

Blake Shelton and Gwen Stefani EMBED
Credit: Kevin Mazur/Getty
Gwen Stefani, Blake Shelton embed
Credit: Kevin Mazur/Getty

After leaving the stage, Blake was back in supportive boyfriend mode as Stefani's biggest fan, even air guitar-ing as he jammed out to her performance. "The tall guy stood up first—good job, Blake," Stefani called him out at one point. Once her set was finished, she snuggled up to her loving beau, sitting with her arm around him and giving him a kiss.

VIDEO: Gwen Stefani's Transformation Through the Years

Shelton and Stefani weren't the only ones having a blast at the star-studded event. Ciara took to Snapchat to share a glimpse of the evening's highlights, including Lionel Richie taking the stage and Jennifer Lopez turning up the heat while breaking it down to "Brick House." She even snapped selfie videos with Jon Bon Jovi and Christie Brinkley while tearing up the dance floor.

Ciara 1
Credit: Ciara / snapchat
Ciara 2
Credit: Ciara / snapchat
Ciara 3
Credit: Ciara / snapchat

Looks like one star-studded summer night.