Sexy army girl Cheryl Cole and Derek Hough bring their intimate stage routine to Wembley

She might not have been the headline act but Cheryl Cole more than stole the show with a raunchy dance routine at the Capital FM Summertime Ball.

The pop star and her friend and dancer Derek Hough got up very close and personal as they performed at the radio station's concert at London 's Wembley Stadium last night.

The pair have already set tongues wagging over their intimate friendship, with some suggesting they are romantically involved.

Feeling hot? Cheryl Cole performed in a khaki bra-top and metallic shorts as she took to the stage at the Capital FM Summertime Ball at Wembley Stadium yesterday

And although it is not known if they are in fact dating, they did little to dispel any rumours about their relationship as they gyrated and danced closely together on stage.

Arriving on stage just before 8.30pm and launched immediately into her debut solo single, Fight For This Love, as thousands of fans erupted into screams.

Backed by a group of dancers who were all dressed in ripped army attire, she danced energetically to the song, which launched her solo career last October.

Just good friends? Cheryl and Derek hold on tight as they sink to the floor

Gyrating: Derek moves Cheryl sexily round his body as they dance to her hit single Parachute

And she looked as though she was having the time of her life, all thoughts of her impending divorce to Chelsea footballer Ashley Cole firmly pushed to the back of her mind.

And she showed off her lithe, petite frame in a pair of sexy pewter-coloured shorts, a cropped green vest top and shiny gold boots.

Fight for this love: Cheryl is accompanied by army-style dancers as she performed her biggest hit

Crowd pleasing: Cole performed to 75,000 people at Wembley Stadium

She then slowed down the track before mixing it into a mash-up of Robin S's 1990 hit Show Me Love, before singing a couple more songs including her cover of Owl Cities' Fireflies.

Her last track was Parachute which brought Hough onto the stage to dance with her, before they walked off stage hand-in-hand together with Cheryl shouting, 'Thank you very much Wembley, good night!.'

The headlining belonged to Rihanna, who jetted into the UK yesterday morning especially to perform.

Good girl gone red: Rihanna sports her funky new red do as she performs as the gig's headlining act

Rude Girl: The singer treated the Wembley crowd to some of her biggest hits

They've got the X Factor: JLS performed to the hometown crowd

Sporting her brand new bright red hairdo, she kicked off her set with Madhouse, the opening track from her album Rated R.

She then launched into Rude Boy and Russian Roulette before ending her set with her biggest and most well-known song Umbrella.

Cheryl's set followed Dizzee Racal, who came on wearing an England shirt, and was joined by Florence Welch of Florence and the Machine for their version of You've Got The Love.

New girls on the block: Pop newcomers Ke$ha (left) and Ellie Goulding

Here come the girls: Pixie Lott and Alexandra Burke delighted the Wembley crowd with their sets

Dizzee came on after Canadian teen sensation Justin Bieber who is starting to make a name for himself on these shores.

But he still had a helping hand from his mentor, R&B singer Usher and The Black Eyed Peas's star will.i.am, as the pair joined him on stage.

Also performing at the gig were JLS, Alexandra Burke, Pixie Lott, Tinie Tempah, Jason Derulo, Ke$ha, Chipmunk, and Ellie Goulding.

Stars and stripes: American rapper Will.i.am, singer Usher and Canadian teen idol Justin Bieber delighted the fans with a performance of OMG

You Got The Love: Florence Welch and Dizzee Rascal cosy up for their duet

Most of the female acts appeared to be competing for the title of sexiest act as they performed in a variety of tiny outfits.

Tik Tok singer Ke$ha, 23, wore black shorts and knee-high boots, while Essex girl Lott, 19, wore a tiny floral mini-dress and fishnet tights.

X Factor 2008 winner Burke, 21, showed off her curves in a studded leotard as she belted out her tracks Bad Boys and Broken Heels.

Teen idol: Canadian pop star Bieber made one young fan's day when he serenaded her on stage

Skin-tight: Rihanna (left) and Burke arrived at Wembley in tight-fitting dresses before changing into their on-stage outfits

Girls on tour: (L-R) Pixie Lott, Ke$ha and Capital FM presenter Lisa Snowdon backstage

Hello London! Esmee Denters and Chipmunk (left) performed their duet Until You Were Gong, while American singer Jason Derulo got the crowd going with his breakdancing