"It'll be a party in the middle of the game," she promises PEOPLE. "All of the sudden, whether your team is winning or losing, we want to make you have a good time. That's our goal."
With a packed crowd of football fans set to fill Cowboys Stadium in Arlington, Texas, Fergie and bandmate Taboo, both 35, are already feeling the "nervous excitement," she says.
"It's a gig that everybody wants," Fergie notes. "It feels so natural with us partnering up with the NFL because we're sports fans and we write a lot of sports anthems. It's what we do."
She adds: "It's a good combination – like chips and salsa."
The Black Eyed Peas also performed at a Super Bowl Bash hosted by Sports Illustrated on Friday.
Meanwhile, among the crowd due on Sunday, Fergie says she'll have some fans of her own: husband Josh Duhamel and her dad. Duhamel, 38, flew in on Friday, and she took her father, a former football coach, as her "date" to an NFL dinner.
So what about life outside her music career? Fergie, who last month celebrated her second anniversary with Duhamel, says she doesn't "go longer than two weeks" without seeing her husband.
"Of course, there's also iChat and Skype, but it's really just paying attention," she says. "Communication and honesty – those are the keys for me."
Oh, and one more thing, she adds: "Yeah, he's gorgeous."