Sugarland singer Jennifer Nettles has been working on a solo album, and now the first single from the project has a release date. Nettles co-wrote 'That Girl,' which is slated to drop in two weeks.

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Nettles is working with famed rock producer Rick Rubin, and in addition to Walker, she has been writing with Sara Bareilles. She's also been recording with an adventurous cast of musicians that includes Red Hot Chili Peppers drummer Chad Smith.

“This album is different than what I’ve done before,” Nettles tells Rolling Stone. “What I do with Sugarland, primarily it’s stuff that starts with me and Kristian writing together. It’s fun to play with that masculine energy, but for this I wanted to do something really personal — more intimate and emotional.”

Though both she and Kristian Bush are working on solo projects right now, Nettles says it's not the end of their partnership in Sugarland. “We’re just taking time to do things individually, personally and professionally,” she tells Billboard. “And we’re super supportive of each other in what we do on both those fronts, personally and professionally.”

There has been no release date announced for Nettles' solo album.