Kelly Clarkson‘sBillboard Music Awardshosting gig was filled with lots of surprises, fromher musical medley openingto herAmerican Idolreunion with Simon Cowell. The superstar also managed to pull off eight outfit changes during the show — and each look was more glamorous than the next. Here, every detail about her on-stage style parade.

When Clarkson stepped onto the red carpet in Las Vegas on Sunday night, the singer was dressed in a black custom Christian Siriano gown with a diagonal neckline, studded, structured shoulders a high slit and a black leather belt (above, center). She paired the design with strappy studded black sandals and a matching clutch, and topped off the look with a red lip.

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For her third Christian Siriano look of the night, Clarkson showed off her curves in a black metallic skin-tight dress (above left) and studded Christian Louboutin boots. She paired the look with gold earrings, nude makeup and straight hair.

Moving on to her Versace moment, the singer changed into a black zip-up leather dress (above middle) from the Italian label, which included a motorcycle-style top and a tight, knee-length skirt. Again, she paired the look with black boots.

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Lambert McAndrews recentlyopened up to PeopleStyleabout what it’s like collaborating with the star, explaining that they collaborate on her looks and try to expand their horizons with each ensemble.

“With heralbum [Meaning of Life] she was very specific on the direction— black, with touches of gold, strong, sexy, feminine, soulful, pop. WithThe Voiceshe kind of lets me run with it,” Lambert McAndrews tells PEOPLE. “I present clothes and ideas for each show to her. We try them on and we go with what we both love the most. Each night we are trying a different vibe. It’s so much fun.”

And when choosing looks for Clarkson, Lambert aims to find pieces that flatter her figure. “She has a beautiful figure and a small waist. I try to put her in outfits that fit her well; fit is the most important part, especially for curvy women.”

She added, “I think the best way to dress her is to show off her body type, show off her curves and accentuate her body type.”

source: people.com