Alicia Keys wears a bright yellow shirt as she shows her support for Barack Obama

There was never any doubt that she would be the centre of attention, but just in case she wasn't Alicia Keys decided to pull out all the stops.

The 31-year-old arrived at the Organizing For America Volunteer Event in Philadelphia yesterday wearing a bright yellow shirt and matching green heels.

As host of the event, Alicia obviously wanted to stand out and ensure that her voice was heard as she continued to support President Barack Obama.

 Despite teaming the silky shirt with a pair of dark denim skinny jeans, the singer still managed to look glamorous.

She ensured that her outfit stayed sexy by keeping the top button of her bright shirt undone and completed her look with the peep-toe heels.

Alicia teamed it with a brown trilby hat and a pair of hoop earrings as she greeted members of the public, and appeared to be wearing minimal make-up.

Alicia kept her fans up to date with her whereabouts yesterday and was clearly feeling fired up about the day's events.

'In Philly to show support for @barackobama ‪#women2012' she wrote on Twitter, before posting: 'What an inspiring day!! When we stand together theres no impossible!! @barackobama ‪#women2012 Let's gooooo!!'

She was later seen posing with a signed poster of the President which was emblazoned with the words 'We've got his back.'

The singer ensured her look was kept glamorous by keeping her top button undone and teaming her shirt with peep-toe heels

Meanwhile, Alicia's husband was was seen at Bagatelle in New York City to attend the launch of Nas' latest album Life Is Good.

The 33-year-old wore a pair of blue jeans, a white T-shirt and smart black blazer as he posed for photos at the Moët Rose event.

He was later seen leaving the venue in a metallic orange sports car while still wearing a pair of dark sunglasses.