Katy Perry is regal in red velvet gown

If it ain't ba-roque, don't fix it! Katy Perry is regal in red velvet gown and embellished cape at UNICEF Snowflake Ball after being named Goodwill Ambassador

She was named a UNICEF Goodwill Ambassador on Tuesday to help children find their voice.

And Katy Perry looked suitably regal in an unusual ensemble later that evening.

The 29-year-old singer wore a red velvet gown and embellished cape as she posed at the organisation's ninth annual Snowflake Ball at Cipriani Wall Street in New York City.

The Fireworks singer showed off her hourglass shape in the halter-neck frock, but covered her shoulders with a red cape.

Fittingly for the event, the cape sported a pattern of a giant gold snowflake.

Katy wore her jet-black hair in a glamorous curled 'do and added a slick of matte red lipstick.

The pop star was named UNICEF's Goodwill Ambassador earlier that day and she was clearly grateful for the opportunity.

'I believe young people have the power to change their own lives, with our help,' she said.

'I am honored to join UNICEF as a Goodwill Ambassador, and committed to doing everything I can to help children and adolescents who come from such different backgrounds but want the same thing: a brighter future,' she added.

Katy has already been working with UNICEF, having traveled with the organisation to Madagascar earlier this year.

Also at the event was Angie Harmon, who wowed in a risque black-and-white strapless gown.

The top featured ruching at the bust while the see-through netting material offered a glimpse of side-boob.

The 41-year-old wore her hair in a wispy updo and enhanced her glowing complexion with a dusting of pink blusher.