She has been dating her daughter's father since 2011 and briefly attended college at the University of Oklahoma, but left after one year.
Brooks finalized his divorce from his first wife Sandy Mahl in 2001.
Yearwood had already divorced her second husband, bassist Robert Reynolds of the Mavericks.
Yearwood and Brooks' musical chemistry was a known quantity.
The nuptials were in stark contrast to Brooks' very public wedding proposal seven months earlier, which was witnessed by Buck Owens, Merle Haggard, George Jones and hundreds of screaming fans.
That surprise engagement took place at Owens' Crystal Palace in Bakersfield, California.
No word on how this golden couple plans to celebrate its ninth anniversary, but on the 11th, Mr. Brooks (or Miss Yearwood, as Garth refers to the missus) are back on stage for a three-night stand in Little Rock, Arkansas.
Dozens of fans took to the social media site to question if the Friends In Low Places singer, 55, had gone the way of Milli Vanilli in belting out his most recent single from his Gunslinger record alongside Mitch Rossell. Garth Brooks, 55, was called out via Twitter by fans who felt he was lip-syncing during his performance of Ask Me How I Know at the 51st annual Country Music Awards at Bridgestone Arena in Nashville, Tennessee, on Wednesday night One user wrote, '280 characters still aren't enough for me to accurately describe how upset I am that Garth Brooks is lip syncing on the CMAs;' another said, 'Did anyone else out there that's watching the CMA awards think Garth Brooks was just lip syncing? #CMAawards.'Some complimented the singer in pointing out the perceived snafu, writing, 'Garth Brooks lip-syncing on the CMA awards makes me question all of humanity.
Say it ain’t say so Garth.'Not all, however, were convinced that the strummin' superstar was pretending: Music outlet Billboard reviewed the outing in saying, 'As always, the tried-and-true road warrior sounded full-throated and flawless performing live, exuding the same skill and confidence that’s made him a living legend.'And a tweet from the CMA's official account read, 'Loving this performance by reigning #CMAawards Entertainer of the Year @Garth Brooks!
The personal challenge for the Georgia-born songstress was to adapt to Brooks' life as the father of three young girls in small-town Oklahoma.
In September, Brooks' youngest daughter, Allie, became a college freshman.