The show must go on: Rihanna plasters on a smile as she headlines the Wireless Festival two days after grandmother Dolly's funeral

PUBLISHED: 23:15, 8 July 2012 | UPDATED: 00:36, 9 July 2012

There were fears that the very recent death of her grandmother would cause Rihanna to pull out of her headlining gig at the Wireless Festival today.

But the singer managed to plaster a smile on her face and dazzle the crowds at the Hyde Park event on Sunday night, after flying in shortly after attending the funeral in New York.

The singer, 24, closed her second festival in as many weeks, and didn't disappoint the waiting fans.

Painting on a smile: Rihanna returned to work two days after her grandmother's funeral, headlining at the Wireless Festival

Appearing onstage in a midriff-baring studded top, lacy 'granny pants' over stockings and peacock-patterned billowing sleeves, the singer gyrated and belted out all of her hits.

She added a black leather cap with a python embellishment and chunky black boots.

Rihanna's hair tumbled in curls down to her waist, after she added lengthy extensions.

Rihanna to the rescue: The singer channelled a super hero with her granny pants over tights look

Headliner: It has been a stellar summer of festivals for the star, who also headlined Hackney Weekend

Hitmaker: The singer belted out hits including We Found Love, Where Have You Been, What's My Name, S& and Rude Boy

Rihanna was pictured leaving her London hotel a few hours earlier and was embraced by fans.

She had flown in the day before, shortly after attending her grandmother Dolly's funeral in Brooklyn.

On Friday, the singer was pictured heading to the service in Brooklyn looking visibly upset.

Thriller: Rihanna performed her hits for the crowds

In the spotlight: Rihanna came down into the crowd

On July 1 she revealed via Twitter that her beloved grandmother had died of cancer at a New York City hospital.

Rihanna had been keeping her Twitter followers up to date with her emotions during the trying time, uploading a number of sweet pictures of her with her ailing relative.

But ever the professional, she was back on form at Wireless on Sunday, and thrilled her adoring fans.

He's behind you! An eager fan tried his luck with the curvy star

The show must go on: Rihanna has been mourning the loss of her grandmother Dolly, but put her sorrow aside to fulfill her commitment

Earlier the crowd had been treated to a performance by Jessie J, who took to the stage shortly before Rihanna.

Wearing denim shorts over the same stripey stockings made famous by Cheryl Cole in 2010, a white crop top and an army jacket.

She came close to revealing a little more than most wanted to see when she performed an energetic high-kick.

Energetic: Jessie J took to the stage ahead of Rihanna

High kick: The energetic star performed her best moves onstage

Holy Moly! Cher Lloyd goes all hells angels on us in leather shorts, tattoos and biker boots at Wireless

Other big names performing on Sunday included Cher Lloyd, Labrinth, Rizzle Kicks, Kaskade and Pitbull.

A host of celebrities have been spotted enjoying the performances, including Rosie Huntington-Whiteley and Jason Statham.

The couple were pictured watching Calvin Harris on the PepsiMax stage, while Rihanna's new co-stars Henry Holland and Nicola Roberts were spotted mingling in the VIP area ahead of her performance.