The Saturdays put their legs on parade for the JLS lads as they turn out for Rochelle Wiseman and boyfriend Marvin Humes's joint birthday party

By Miss FB Lyimo*

It was the hottest day of the year so far which also brought with it an unseasonably balmy evening.
Giving the Saturdays girls more than enough reason to ditch the tights and bare their legs as they partied in London last night.
The girls were out to celebrate the birthday of band member Rochelle Wiseman, who was having a joint party with JLS boyfriend Marvin Humes.

They've got legs: Mollie King and Frankie Sandford from The Saturdays flash their toned and tanned pins as they head out to celebrate bandmate Rochelle Wiseman's joint birthday party with her JLS boyfriend Marvin Humes

Mollie King, 23, and Frankie Sandford, 22, were the first to be snapped together as they arrived at the Alto nightclub.
Both looked stunning in their little party dresses, with Mollie opting for a pink, grey and black dress with a piece of mesh across her cleavage, while Frankie wore a black and white animal print frock.

Shining bright: Vanessa White sparkled in gold sequins while birthday girl Rochelle Wiseman stood out in a red velvet dress

They were joined by Vanessa White, 21, who wore a gold sequinned dress and purple extensions in her hair.
She was given an unusual lift to the party by her friend who couldn't resist picking her up and spinning her around as she screamed with laughter.

Let's go for a spin! Vanessa White holds on tight as her friend picks her up and whizzes her around

But it was the birthday girl who made the biggest impression as she managed to transform from a fresh-faced pop star to a sexy vamp.

After arriving at the May Fair Hotel on Friday afternoon in barely-there make-up, she later emerged looking dressed to kill in a figure-hugging little red dress and lashings of make-up.

Ready to party: Rochelle Wiseman and Marvin Humes leave the May Fair Hotel to head to the Alto nightclub a few block away tonight

Let's go clubbing: As Marvin climbs in, Rochelle directs the cab driver to their next destination

Wiseman was on the arm of her boyfriend Marvin Humes as they headed to the nightclub in Soho after a bite to eat at Gilgamesh in Camden Town.
Joining Wiseman and Humes at the party to celebrate their 22nd and 26th birthday respectively were their Saturdays and JLS bandmates.
Clearly excited about the party, Wiseman Tweeted beforehand: 'Party tonight wooo... Can't wait to see all my friends. Am sooooo excited.'

Party guests: Marvin's JLS band mate JB Gill arrives at the nightclub with his girlfriend Chloe Tangney

Her bandmate Mollie King appeared equally enthused, Tweeting: 'Party time people!!!! Who's ready!?!?!? Let's make some shapes.'
Vanessa White added: 'How I'm super excited for the night ahead! It is going down tonight!!!!'

Laidback: Wiseman looked fresh-faced and relaxed in a leather jacket and leggings as she arrived at the May Fair Hotel on Thursday evening with her boyfriend

Missing out on all the fun was oldest bandmate Una Healy, who was visiting her family at home in County Tipperary.

Missing out: Wiseman's Saturdays bandmate Una Healy, pictured with boyfriend Ben Foden, flew home to Ireland

She lamented on Twitter: 'Really sad I'll be missing Rochelle's party night out tonight :( ... but gonna be home visiting my family :).'
Earlier this week, the former S Club Juniors star laughed off reports the couple were spending £50,000 of their birthday celebrations at the Merah club in Fitzrovia.
Wiseman said: 'Just read that we are spending £50k on a birthday party at a club called Merah, are you kidding?! Not true!'
Last weekend, the couple enjoyed a romantic night out to see the West End musical Wicked.
The couple originally split in November after eight months together, but it appeared absence made the heart  grow fonder and they were back on by January.
During their two month break, Humes admitted their busy schedules meant they rarely spent time together.
He told Reveal magazine: 'We definitely argued. Every couple does. We wouldn't be normal if we said we didn't.
'But we never had blazing rows, just silly things like what to watch on the telly. She'd want to watch Keeping Up With The Kardashians, while I'd want to watch the football.'
Humes and Wiseman started dating last March after regularly bumping into each other on the awards and concert circuit.
By July, Wiseman moved in with Humes into the West London home he had previously shared with bandmate Aston Merrygold.
Earlier this month, they cemented their reunion with a romantic break in Dubai.