Gwen Stefani

Gwen Stefani

Gwen Stefani made her first public appearance at the Coachella Valley Music and Arts Festival since giving birth to her third child.

The No Doubt front woman, who welcomed son Apollo into the world on February 28, debuted her slim post-pregnancy figure as she joined Pharrell Williams during his set to perform her hit 'Hollaback Girl' on Saturday night (12.04.14).

The blonde beauty, who also has sons Zuma, five, and Kingston, seven, with husband Gavin Rossdale, received a warm welcome from the new 'The Voice' USA mentor, who introduced her to the crowd saying: "The name of my album is called 'Girl' and I can tell you right now there's only been one, incredible, historical, most important, incredibly talented, f**king awesome, rad girl in the world."

Clearly glad to be back on stage, the 44-year-old blonde beauty later tweeted: "Feels good to be out of the cave #Cochella2014 @Pharrell gx"

The producer and singer's star-studded set also featured cameos from Snoop Dogg as they performed their hits 'Beautiful,' and 'Drop It Like It's Hot,' Nelly for his track 'Hot in Herre,' and P. Diddy and Busta Rhymes for 'Pass the Courvoisier.'

But the 'Happy' hitmaker, 40, admitted he struggled to cope with the dust at the Empire Polo Club in Indio, California.

He said: "You don't even understand how hurt my feelings are right now that I'm losing my voice because of all this dust, because we really had something special planned for you.

"I really had some crazy s**t planned for you guys, but I'm just going to go for it anyways."