Gwen Stefani makes a surprise appearance at Blake Shelton's Los Angeles show, parties backstage


Gwen Stefani is back on stage with her boo!

The 47-year-old singer attended boyfriend Blake Shelton's Doing It to Country Songs Tour stop at The Forum in Los Angeles on Friday, and surprised fans by joining him for an adorable rendition of their duet, "Go Ahead and Break My Heart."

WATCH: Gwen Stefani Reveals Valentine's Day Present From Blake Shelton

Stefani went full-on glam for the show, donning a black turtleneck top, shiny patterned mini skirt and thigh-high boots, keeping her platinum blond tresses pulled back into a messy top knot. The 40-year-old country crooner was rocking a much more casual look, sporting comfy blue jeans and a gray button-down shirt.

Naturally, the No Doubt frontwoman took to Snapchat to share some behind-the-scenes pics and videos, snapped backstage at the iconic venue. Judging by the photos, which included "A cake for Blake," stamps with the couple's faces and red solo cups laid out to form the letter "B," it appears the backstage party was a blast!

WATCH: Gwen Stefani Shares Steamy Valentine's Day Kiss With Blake Shelton

Although Shelton isn't an avid Instagram user -- his page only has six pics! -- he couldn't help himself from sharing a sweet photo of himself chatting with an elderly fan after the show. "Hope I'm still showin up to country shows at 96!!" he captioned it.

Hope I'm still showin up to country shows at 96!!

A post shared by Blake Shelton (@blakeshelton) on

Earlier this week, Stefani was a guest on The Tonight Show Starring Jimmy Fallon, where she joked about some of her and Shelton's differences.

"I think he's quite miserable when he's not in the woods or, like, somewhere in camo," she said of Shelton not being a city guy. "He really likes to be camouflaged."

WATCH: Gwen Stefani Gushes About Boyfriend Blake Shelton, Reveals the One Thing That Was Almost a Deal Breaker

"I know that for me I just go anywhere, and I know I'm gonna get hounded for pictures or whatever," she continued. "I don't mind, you know what I mean? For him, he's just not used to that, like I said. He's in the woods most of the time but, yeah, we went [to Disneyland recently]. It was crazy. It was, like, a billion people there."

PHOTOS: Gwen and Blake at the White House State Dinner

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Gwen Stefani and Blake Shelton at the White House state dinner
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Gwen Stefani and Blake Shelton at the White House state dinner
Singers Gwen Stefani and Blake Shelton attend the State Dinner for Italian Prime Minister Matteo Renzi at the White House in Washington on October 18, 2016. / AFP / YURI GRIPAS (Photo credit should read YURI GRIPAS/AFP/Getty Images)
Singer Gwen Stefani performs during the State Dinner for Italian Prime Minister Matteo Renzi at the White House in Washington on October 18, 2016. / AFP / YURI GRIPAS (Photo credit should read YURI GRIPAS/AFP/Getty Images)
Singer Gwen Stefani performs during the State Dinner for Italian Prime Minister Matteo Renzi at the White House in Washington on October 18, 2016. / AFP / YURI GRIPAS (Photo credit should read YURI GRIPAS/AFP/Getty Images)
Singers Gwen Stefani and Blake Shelton attend the State Dinner for Italian Prime Minister Matteo Renzi at the White House in Washington on October 18, 2016. / AFP / YURI GRIPAS (Photo credit should read YURI GRIPAS/AFP/Getty Images)
Singer Gwen Stefani performs during the State Dinner for Italian Prime Minister Matteo Renzi at the White House in Washington on October 18, 2016. / AFP / YURI GRIPAS (Photo credit should read YURI GRIPAS/AFP/Getty Images)
WASHINGTON, DC - OCTOBER 18: U.S. entertainers Gwen Stefani and Blake Shelton (C) and New York Gov, Andrew Cuomo attend a state dinner for Italian Prime Minister Matteo Renzi, hosted by President Barack Obama on the South Lawn of the White House October 18, 2016 in Washington DC. The president and first lady Michelle Obama will tonight host their final state dinner, with singer Gwen Stefani performing. (Photo by Michael Reynolds-Pool/Getty Images)
WASHINGTON, DC - OCTOBER 18: U.S. entertainer Gwen Stefani attends a state dinner for Italian Prime Minister Matteo Renzi, hosted by President Barack Obama on the South Lawn of the White House October 18, 2016 in Washington DC. The president and first lady Michelle Obama will tonight host their final state dinner, with singer Gwen Stefani performing. (Photo by Michael Reynolds-Pool/Getty Images)
Singers Gwen Stefani and Blake Shelton attend the State Dinner for Italian Prime Minister Matteo Renzi at the White House in Washington on October 18, 2016. / AFP / YURI GRIPAS (Photo credit should read YURI GRIPAS/AFP/Getty Images)
Singers Gwen Stefani and Blake Shelton attend the State Dinner for Italian Prime Minister Matteo Renzi at the White House in Washington on October 18, 2016. / AFP / YURI GRIPAS (Photo credit should read YURI GRIPAS/AFP/Getty Images)
WASHINGTON, DC - OCTOBER 18: U.S. entertainer Gwen Stefani performs at a state dinner for Italian Prime Minister Matteo Renzi, hosted by President Barack Obama on the South Lawn of the White House October 18, 2016 in Washington DC. The president and first lady Michelle Obama will tonight host their final state dinner. (Photo by Michael Reynolds-Pool/Getty Images)
WASHINGTON, DC - OCTOBER 18: U.S. entertainer Gwen Stefani performs at a state dinner for Italian Prime Minister Matteo Renzi, hosted by President Barack Obama on the South Lawn of the White House October 18, 2016 in Washington DC. The president and first lady Michelle Obama will tonight host their final state dinner. (Photo by Michael Reynolds-Pool/Getty Images)
WASHINGTON, DC - OCTOBER 18: U.S. entertainer Gwen Stefani performs at a state dinner for Italian Prime Minister Matteo Renzi, hosted by President Barack Obama on the South Lawn of the White House October 18, 2016 in Washington DC. The president and first lady Michelle Obama will tonight host their final state dinner. (Photo by Michael Reynolds-Pool/Getty Images)
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