Jason Merritt/Getty; inset; Isaac Brekken/Getty
April 06, 2014 07:35 PM

Britney Spears rules Vegas with her star-studded show, but little sister Jamie Lynn Spears isn’t far behind.

Jamie Lynn, 23, is Tweeting up a storm as the social media correspondent for Sunday night’s Academy of Country Music Awards, and her debut song “How Could I Want More” is already making waves on the radio.

“I worked on this project for a really long time,” she said on the red carpet outside the MGM Grand Garden Arena in Las Vegas during GAC’s live pre-show. “The single means a lot to me, and I was finally brave enough to put it out there.”

Luckily for newly married Jamie Lynn, big sis Britney has her back.

“Your sister is always someone you’re going to look up to,” she says. “We’re in the same kind of industry but different genres, so definitely it’s good to take her advice.”

Britney may be a pop icon, but the former Nickelodeon actress prefers country: Jamie Lynn fan-girled over meeting Keith Urban and Sheryl Crow behind the scenes of the awards.

Stay with PEOPLE for more ACM coverage, and catch the show on CBS (8 p.m. ET).

Watch the Best Moments from the ACM Awards in 2 Minutes!

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