Garth Brooks' daughter gets engaged after singing back-up at his concert on 21st birthday


It was an eventful 21st birthday for country singer Garth Brooks' daughter, who was serenaded with the "Happy Birthday" song by fans at her dad's concert, and then got engaged backstage just moments later.

Read: Country Singer Garth Brooks Gifts Honeymoon to Couple Who Got Engaged at His Concert

Allie Colleen Brooks began her big evening by joining her dad on stage as a back-up singer during his concert at The Forum in Los Angeles over the weekend.

"Garth Brooks' back-up singers are the best, they've been around for a long time, singing with him 25 years or more," Hunter Kelly, senior correspondent at Rare Country, told InsideEdition.com. "I could tell she really had to have been studying and rehearsing to get up there."

28 PHOTOS
Garth Brooks and Trisha Yearwood through the years
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Garth Brooks and Trisha Yearwood through the years
Garth Brooks and Trisha Yearwood perform a medley of songs at the 50th Annual Country Music Association Awards in Nashville, Tennessee, U.S., November 2, 2016. REUTERS/Harrison McClary
NASHVILLE, TN - NOVEMBER 02: Singers Garth Brooks and Trisha Yearwood attend the 50th annual CMA Awards at the Bridgestone Arena on November 2, 2016 in Nashville, Tennessee. (Photo by Jason Davis/FilmMagic)
ANAHEIM, CA - SEPTEMBER 16: Garth Brooks and Trisha Yearwood Pre-Concert Press Conference at Honda Center on September 16, 2016 in Anaheim, California. (Photo by Jerod Harris/Getty Images)
NEW YORK, NY - JULY 08: Garth Brooks and Trisha Yearwood speak during press conference at Yankee Stadium on July 8, 2016 in New York City. (Photo by Chance Yeh/FilmMagic)
LAS VEGAS, NV - JUNE 24: Singer Trisha Yearwood (L) and singer/songwriter Garth Brooks speak during a news conference ahead of the first of their six scheduled shows at T-Mobile Arena on June 24, 2016 in Las Vegas, Nevada. (Photo by Mindy Small/FilmMagic)
NASHVILLE, TN - NOVEMBER 04: Garth Brooks and Trisha Yearwood attend the 49th annual CMA Awards at the Bridgestone Arena on November 4, 2015 in Nashville, Tennessee. (Photo by Taylor Hill/Getty Images)
ARLINGTON, TX - APRIL 19: Honoree Garth Brooks (L) and singer Trisha Yearwood attend the 50th Academy Of Country Music Awards at AT&T Stadium on April 19, 2015 in Arlington, Texas. (Photo by C Flanigan/FilmMagic)
ARLINGTON, TX - APRIL 19: Musicians Trisha Yearwood (L) and Garth Brooks attend the 50th Academy Of Country Music Awards at AT&T Stadium on April 19, 2015 in Arlington, Texas. (Photo by Michael Buckner/ACM2015/Getty Images for dcp)
DALLAS, TX - APRIL 17: Hosts Trisha Yearwood (L) and Garth Brooks perform onstage during the ACM Lifting Lives Gala at the Omni Hotel on April 17, 2015 in Dallas, Texas. (Photo by Jason Kempin/ACM2015/Getty Images for dcp)
DALLAS, TX - APRIL 17: Hosts Garth Brooks (L) and Trisha Yearwood kiss onstage during the ACM Lifting Lives Gala at the Omni Hotel on April 17, 2015 in Dallas, Texas. (Photo by Jason Merritt/ACM2015/Getty Images for dcp)
NASHVILLE, TN - FEBRUARY 25: Recording artists Trisha Yearwood and Garth Brooks present awards during the Opening Ceremonies of CRS 2015 on February 25, 2015 at the Nashville Convention Center in Nashville, Tennessee. (Photo by Jason Davis/WireImage)
NEW YORK, NY - NOVEMBER 17: Trisha Yearwood and Garth Brooks attend the ASCAP Centennial Awards at Waldorf Astoria Hotel on November 17, 2014 in New York City. (Photo by Brian Ach/Getty Images for ASCAP)
ATLANTA, GA - SEPTEMBER 19: Garth Brooks and Trisha Yearwood attend a press conference at Children's Healthcare of Atlanta at Scottish Rite on September 19, 2014 in Atlanta, Georgia. (Photo by Chris McKay/Getty Images)
LAS VEGAS, NV - APRIL 06: Recording artists Garth Brooks (L) and Trisha Yearwood attend the 49th Annual Academy of Country Music Awards at the MGM Grand Garden Arena on April 6, 2014 in Las Vegas, Nevada. (Photo by Rick Diamond/ACMA2014/Getty Images for ACM)
NASHVILLE, TN - NOVEMBER 22: Trisha Yearwood and Garth Brooks perform during Playin' Possum! The Final No Show Tribute To George Jones at Bridgestone Arena on November 22, 2013 in Nashville, Tennessee. (Photo by Frederick Breedon IV/FilmMagic)
NORMAN, OK - JULY 06: Musicians Trisha Yearwood and Garth Brooks speak in the press room at the Oklahoma Twister Relief Concert to benefit United Way of Central Oklahoma May Tornadoes Relief Fund at Gaylord Family Oklahoma Memorial Stadium on July 6, 2013 in Norman, Oklahoma. To donate go to www.unitedwayokc.org or text REBUILD to 52000. (Photo by Rick Diamond/Getty Images for Shock Ink)
NASHVILLE, TN - MARCH 06: Trisha Yearwood and Garth Brooks attends the 2012 Country Music Hall of Fame Inductees announcement at the Country Music Hall of Fame and Museum on March 6, 2012 in Nashville, Tennessee. (Photo by Frederick Breedon IV/FilmMagic)
Garth Brooks and Trisha Yearwood perform at the Juvenile Diabetes Research Foundation Gala at the Beverly Hilton on May 15, 2008 in Beverly Hills, California. (Photo by Matthew Simmons/WireImage)
NEW YORK, NY - JUNE 16: Performer Trisha Yearwood and inductee Garth Brooks attend the Songwriters Hall of Fame 42nd Annual Induction and Awards at The New York Marriott Marquis Hotel - Shubert Alley on June 16, 2011 in New York City. (Photo by Larry Busacca/Getty Images for Songwriters Hall of Fame)
Trisha Yearwood and Garth Brooks during 2007 MusiCares Person Of The Year Honoring Don Henley - Arrivals at Los Angeles Convention Center in Los Angeles, California, United States. (Photo by M. Tran/FilmMagic)
Trisha Yearwood and Garth Brooks (Photo by Michael Caulfield/WireImage for PMK/HBH)
Trisha Yearwood and Garth Brooks (Photo by SGranitz/WireImage for The Recording Academy)
Garth Brooks and Trisha Yearwood during Disneyland 50th Anniversary 'Happiest Homecoming On Earth' Celebration at Disneyland in Anaheim, California, United States. (Photo by Gregg DeGuire/WireImage)
Trisha Yearwood and Garth Brooks during 33rd Annual Songwriters Hall of Fame Awards at Sheraton Hotel in New York City, New York, United States. (Photo by Bill Davila/FilmMagic)
Garth Brooks and Trisha Yearwood during 33rd Annual Academy of Country Music Awards at Universal Ampitheater in Universal City, California, United States. (Photo by Ron Galella, Ltd./WireImage)
THE TONIGHT SHOW WITH JAY LENO -- Episode 1222 -- Pictured: (l-r) Musical guests Garth Brooks and Trisha Yearwood on September 11, 1997 -- (Photo by: Margaret Norton/NBC/NBCU Photo Bank via Getty Images)
Garth Brooks and Trisha Yearwood during Songwriters Hall of Fame Awards - VIP Room at Sheraton Hotel in New York City, New York, United States. (Photo by L. Busacca/WireImage)
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Kelly, who shared videos from the concert on social media, said the country artist didn't introduce his daughter by their shared last name until he invited her to center stage and asked fans to sing "Happy Birthday."

"It was a really cool moment for her to step in there," Kelly said. "You could tell it was emotional for both of them. He had to be so proud of her."

After Allie thanked the audience, she went backstage, where she was met by her boyfriend, Jonathan Roberts, who dropped down on one knee to propose as Brooks played his 1995 hit, "She's Every Woman."

Read: Girl With Down Syndrome Cannot Contain Her Joy When Boyfriend Gives Her a Promise Ring

"I'm beyond blessed to have this beautiful woman in my life," Roberts wrote in a post on Facebook. "She's anything but typical. She's so unpredictable."

Fans later found out about the engagement when Roberts posted videos to social media of their engagement.

"It seemed like a really cool 21st birthday," Kelly said.

Watch: Girl Throws Costco-Themed 5th Birthday Party, Complete With Memberships and Food Samples

55 PHOTOS
Stunning, unique styles of engagement rings
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Stunning, unique styles of engagement rings

Platinum iolite diamond ring, $4,100, Cathy Waterman available at Oak Gem

ST. ANDREWS, SCOTLAND - FEBRUARY 25: Kate Middleton during a visit to the University of St Andrews on February 25 2011 in St. Andrews, Scotland. Kate and William first met and graduated while students at St Andrews University. (Photo by David Cheskin - WPA Pool/Getty Images)

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Round-cut engagement ring with pavé diamond band, price upon request, David Yurman

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Style 35404, vintage hexagon-shaped engagement ring set in platinum, $3,125 (center stone not included), Monique Lhuillier Fine Jewelry available at Blue Nile
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"Juliette" 18k gold and diamond London blue topaz engagement ring, $7,500, Erica Courtney
"Scalloped Bezel" engagement ring set in 18K yellow gold with a cushion-cut blue sapphire, price upon request, Megan Thorne

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Style R01540017, 18K rose gold slice diamond engagement ring, $4,000, L'Dezen Jewellery
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Style SS6955, Pirouetta Collection handcrafted engagement ring, $5,100 (center stone not included), Kirk Kara
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Style R2954/R1, 1.25-1.5 carat round diamond in platinum, $3,550 (center stone not included), Parade Design
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