A press release shared by NBC stated that Underwood came to executives with the idea to invite Jett to join. This isn't the first time Underwood and Jett have teamed up together: Just last month, the two sang a medley of classic-rock hits at the 2019 CMA Festival. Jett's 1988 song "I Hate Myself For Loving You" inspired the NFL theme, which was used as the intro from 2006 to 2015, with performances by Pink, Faith Hill and then Underwood.
In June, Underwood -- along with eight other defendants -- was hit with a lawsuit claiming that she copied the 2018 Sunday Night Football theme song, "Game On," from Nashville singer/songwriter Heidi Merrill. That lawsuit is still pending.
It was also recently announced that Underwood will host the 2019 CMA Awards, with Reba McEntire and Dolly Parton stepping in for her typical co-host Brad Paisley, on Nov. 13 in Nashville.