Billboard Music Awards fashion: Miley Cyrus forgets her trousers, Katy Perry matches grandma in pastels

The Billboard Music Awards 2012 in Las Vegas on Sunday saw a whole array of fashion choices.

Billboard Music Awards 2012, Miley Cyrus, Katy PerryBillboard Music Awards 2012 saw Miley Cyrus and Katy Perry make interesting fashion choices. Copyright [Wenn]

Miley Cyrus decided to leave her trousers at home and wore a white V-front Jean Paul Gaultier blazer as a dress for the Billboard Music Awards 2012.

We're lusting after those black and white striped Christian Louboutin heels.

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Katy Perry followed her purple hair's lead by donning a lavender Blumarine gown.

The singer wins the award for best date: her grandmother Ann Hudson!

Carrie Underwood, Billboard Music Awards 2012Carrie Underwood looked like a fairytale princess at the Billboard Music Awards 2012. Copyright [Wenn]

Carrie Underwood made us relive our fairytale princess fantasies in a gorgeous pastel Oscar de la Renta ballgown with embellished pink clutch.

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Lace was also a big hit on the Billboard Music Awards red carpet at the MGM Grand Garden Arena.

Taylor Swift was sexy in a red Elie Saab dress with lace bodice.

Taylor Swift, Natasha Bedingfield, Jordin Sparks, Billboard Music AwardsTaylor, Natasha and Jordin wore lace to the Billboard Music Awards. Copyright [Wenn/Getty]

Natasha Bedingfield, who paid tribute to Donna Summer at the Billboard Music Awards, went for lace and netting in her floor-length turquoise number.

Jordin Sparks, who sang the Whitney Houston classic 'I Will Always Love You' during the ceremony, went for a lacy Diane von Furstenberg minidress.

Who do you think was best dressed?