Gwen Stefani's Coachella Cameo Hints At Solo Return?

Gwen Stefani performs with Pharrell at Coachella 2014
Christopher Polk/Getty Images

No Doubt's Gwen Stefani performs with Pharrell Williams during day 2 of the 2014 Coachella Valley Music & Arts Festival at the Empire Polo Club on April 12, 2014 in Indio, California. 

Pharrell suggests that his "Hollaback Girl" guest is returning to the music industry.

Gwen Stefani bestowed the 2014 Coachella Valley Music & Arts Festival with one of its biggest surprises when she skipped onstage during Pharrell Williams' set on Saturday night (April 12) to perform her Neptunes-produced hit "Hollaback Girl."

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Before she departed the stage after the song, Pharrell teased that the rare live appearance from Stefani was the start of a comeback effort for the singer, who has not released a solo album since 2006.

"Before she leaves, I have not seen her in nine months," Pharrell told his audience after he and Stefani embraced onstage. "Look how amazing the queen looks as she is making her arrival back to the music industry."

Stefani has not formally announced any plans for a solo comeback, but a Twitter post after the performance suggests that she enjoyed the stage return on Saturday night. "Feels good to be out of the cave #Cochella2014 @Pharrell gx," she wrote.

The 2006 release of Stefani's sophomore album, "The Sweet Escape," was followed by a prolonged period of returning to No Doubt to work on the group's sixth studio album, "Push and Shove," which was finally released in September 2012. Stefani and Bush frontman Gavin Rossdale have welcomed three children since 2006, most recently welcoming their son Apollo Bowie Flynn last February.

Pharrell Williams' Coachella performance also featured surprise cameos from Busta Rhymes, Diddy, Nelly, Snoop Dogg, Tyler The Creator and Diplo. Watch the full performance below.