The Spice Girls could be set to sign a multi-million pound deal to play gigs as a foursome in Las Vegas.
Victoria Beckham has given her blessing to let band mates Mel C, Mel B, Emma Bunton and Geri Halliwell perform without her as she continues to focus on her fashion career.
A Las Vegas source told the Daily Star newspaper: "Mel B has been working on her contacts for weeks now.
"Victoria has not budged on her stance to not join them, so they are planning to go out as a foursome.
"It will take them a good 18 months to get all the parts in place if they want to do a residency and possibly a tour to follow."
The band mates have been discussing a residency at Planet Hollywood, following in the footsteps of Britney Spears, and the shows are being planned for 2016, which marks the 20th anniversary of the band's hit 1996 song 'Wannabe'.
The concerts could earn the band up to £20 million but Victoria, 39, feels her days on stage are over and Mel B, 38, is taking the lead on the project, while promoters are said to have approached Backstreet Boys to perform as a support act.
Brian Littrell allegedly said: "We are actually in early talks about maybe doing a world tour together with the Spice Girls", before the band denied the claims.

James Middleton admits the Middleton family are "close".
The Duchess of Cambridge's brother - who co-founded Boomf, a service which offers to print Instagram photographs on to marshmallows - says his parents' strong work ethic has rubbed off on him and insists the whole family pulls together and is extremely supportive of anything they decide to pursue.
He told the Evening Standard newspaper: "For Mum and Dad ... work and home is family, so work is family and home is family. We grew up with that.
"We're great at doing it. It's about producing many different mediums to be able to celebrate. Celebrations are great fun. Bunting and this and that and the other.
"I love my family very much and I'm very, very close to [them]. I support everything every single person in my family does and vice versa."
Asked if he views being a Middleton as a negative or positive in business, he added: "Both. But like anything you want to be known as an individual, not what people perceive you to be."

Sinitta would love to see "fearless" Rihanna join the UK 'X Factor' judges panel.
The 'So Macho' singer - who has appeared as a guest star during the judges' houses stage of the competition in previous years - insists the 'Diamonds' hitmaker has everything it takes to be a good mentor to contestants on the forthcoming series of the ITV singing contest.
Talking to BANG Showbiz at the premiere of 'Noah' in London's Leicester Square on Monday (31.03.14), she said: "I'm gonna to Rihanna. I think she's current, she's relevant, fearless. I think she really knows what she likes and what she doesn't like and she would bring that out in the contestants. I think she'd be fun to watch."
Simon has reportedly been trying to hire Rihanna to join the show - alongside confirmed judge Cheryl Cole - because she draws lots of media attention and he's desperate to make the programme more popular than BBC One rival 'Strictly Come Dancing'.
A source previously said: "Simon and Cheryl have two months to find someone to sit in that chair and they want to get the right person.
"This year is an important one for 'The X Factor'. Simon can't be complacent and has to come back with a real A-Team.
"Rihanna would be a shock selection because she is not an obvious choice for a family show - but that's what he wants."

Ritchie Neville and Natasha Hamilton are expecting a baby together.
The 5ive singer and the Atomic Kitten star fell in love after starring on ITV2 show 'The Big Reunion' last year and have now taken their blossoming relationship to a whole new level.
Unveiling the news of her pregnancy in the new issue of Britain's OK! magazine, Natasha enthused: "It's a complete miracle!"
The red head - who separated from her husband of six years, Riad Erraji, last July - is already a mother to young sons Alfie, Harry and Josh, but the baby will be 34-year-old singer Ritchie's first child.
Natasha admits the 'Keep on Movin' hitmaker was overcome with anxiety when he saw the first images of the new life they had created together, laughing: "After the first scan I could breathe - but Ritchie went into panic mode."
However, the pop hunk is determined to be a hands-on father and get involved with every last detail of the impending birth.
He said: "Natasha's stuck with me forever now, no matter what happens! I want to be a hands-on dad. Tash will be feeding the baby and I'll be feeding her sandwiches."
While the couple recently announced their intention to move in together, Natasha insists they won't be walking down the aisle any time soon.
She added: "We've talked about marriage before - but there's no rush."

Halle Berry says her son has a "different energy" to her daughter.
The 47-year-old actress - who has five-year-old Nahla with ex-boyfriend Gabriel Aubry and five-month-old Maceo with husband Olivier Martinez - has found there have always been clear differences between her two kids, even from such a young age.
Asked how her son is, she said: "Fantastic. It's different, the energy. Whoever says they're not different from the start, they've never had both."
The 'Frankie and Alice' actress also admitted being a parent has had an impact on her work because having kids has been such a "life-changing" experience.
She told E! News: "Being a mom - that started when I had my daughter six years ago - you do start to bring different levels to your performances because being a mom is so life-changing and transforming when you have that right of passage and so it would be very hard for me not to bring that to every single thing that I do and I love that."
While Halle loves motherhood, she recently admitted she isn't planning to have any more children.
She said: "I'm surprised I had the one I just had! So I doubt God is going to bless me again. I think I'm done!"

Gwyneth Paltrow and Chris Martin are holidaying on Faith Hill and Tim McGraw's private island.
The former couple - who announced last week they were ending their 10-year marriage - flew from Eleuthera in the Bahamas, where they have been vacationing since news of their split broke, to nearby Goat Cay with their children Apple, nine. and Moses, seven, by private plane on Sunday (30.03.14).
A source who saw the pair boarding their plane told MailOnline: "They looked happy and calm. Chris was wearing a hat and Gwyneth was casual in a white t-shirt...they drove right up to their private jet with the kids in tow."
The plane took off around 9.50am and landed in Cave Cay, a private islet where commercial aircraft are banned, and were met by an "entourage of staff" before boarding a private boat to take them to the 17-acre island which their friends - who they bonded with when Gwyneth and Tim made 'Country Strong' together in 2010 - have owned since 2008.
The island boasts a 15,000-square-foot, four-bedroom house that comes complete with a lookout tower, as well as three smaller houses for their staff.
Despite their separation, the Coldplay frontman and the 'Iron Man 3' star have pledged to stay friends for the sake of their kids and appeared closer than ever on their holiday last week.
An onlooker in a restaurant where the pair were dining said: "Chris was making Gwyneth laugh until she had to wipe tears from her eyes.
"You wouldn't believe they were divorcing. They were deep in conversation and looked really happy together."

Rita Ora was "obsessed" with an illustration which she had tattooed to her rib cage.
The 'I Will Never Let You Down' singer, who already had a number of inkings, has gone topless on the front cover of the May edition of UK ELLE magazine and shows off the huge pin-up girl tattoo inspired by a Alberto Vargas image.
She told the magazine: "It's based on an original piece by Alberto Vargas, who was an incredible illustrator in the 1930s.
"He was one of the creators of the pin-up image. That's our build, our power.
"That's why I was obsessed with it, learning what men don't understand about women and what women don't understand about men.
"I was obsessed with the painting a long time ago, and then I got it done six months ago.'
"I just love pretty things, whether it is art, a song or a pair of shoes."
The 23-year-old star - who is dating DJ Calvin Harris - chose tattooist Bang Bang McCurdy to create the art work, which took five hours and was described as "the most detailed tattoo" he'd ever done for a celebrity.
He said at the time: 'The tattoo is on her right ribcage. It's big! When she's standing it's about seven inches tall, but when she's laying down it's about 10 inches, plus."

Lindsay Lohan's credit cards were reportedly rejected on a shopping trip.
The 'Mean Girls' actress is said to have attempted to make a purchase worth $300 at the Rag & Bone shop on Mercer Street in Soho, New York over the weekend, but was left red faced when the store wouldn't accept her cards.
A source told the New York Post newspaper: "Lindsay was trying to buy something for around $300 but her credit cards were declined. She looked really embarrassed and tried to negotiate before her friend finally stepped in and paid."
A representative for the 27-year-old star - who is said to be so strapped for cash that the production company behind her reality show on Oprah Winfrey's OWN network had to pay the security deposit and rent for her apartment - denied the reports as "completely false."
The news of her cards being rejected comes just hours after it was reported that she had parted ways with her personal assistant Matt Harrell because she couldn't afford to pay his wages.
A source said: "Lindsay would love to have Matt back as her assistant, but she just can't afford him. He did a really good job for her."

James Franco will play a gay activist in a biopic on Michael Glatze. The 35-year-old actor - who is currently starring in Broadway's 'Of Mice and Men' - will help tell the story of the co-founder of Young Gay America magazine, who made headlines after...

Lesley Joseph "struggled" to get back in shape for 'Birds of a Feather'.
The 68-year-old actress reprised her role as man-eater Dorian Green for a stage production of the sit-com in 2012, and admits slimming down to fit into her tight costumes for the show and subsequent new TV series wasn't easy.
She said: " I had to struggle quite a lot to get the weight off, and to get the legs... My legs have had amazing reviews, it has been a disappearing act because I had allowed myself to appreciate the occasional apricot and crumble and things, so I put on a little bit of weight and when I knew we were doing it on stage, I thought, the entrance that Dorian's got to have, I've got to be the weight I was before.
"So I employed a wonderful fitness and lifestyle coach called Belinda who was quite strong on me and I lost about a stone and a half, getting towards two stone, the legs slimmed, everything slimmed, and then when we went back on television, I thought, 'I can't eat now because I've got to keep it all off' and now I'm doing 'Hot Flush' on stage, it's hard work."
Lesley is proud of the success the revived TV show - which also stars Linda Robson and Pauline Quirke -has received, and she thinks a lot of the credit needs to go to the scriptwriters.
Speaking to Graham Norton on Radio 2, she said: "I think where they've been very clever is they updated it by 15 years rather than expecting us to go on where we left off. And they scripts have been clever enough to incorporate what's going on now, so we fit in very easily with the modern world."

Louis Walsh thinks his 'I Can't Sing' character is "far too old", according to Ashley Knight.
The 61-year-old 'X Factor' judge is portrayed by the West-end actor in the new musical written by Harry Hill and based on Simon Cowell's ITV talent show, and he reportedly told the star that he was too old to play him, despite being seven years older.
Ashley told HELLO! magazine: "He came up to me before the show and said I am far too old to play him."
However, the 54-year-old actor claims the Irish music mogul changed his mind after seeing the show because he was so impressed with his performance.
He added: "But I think I won him over because at the end, he came up to me and said I have all his 'isms'. I'm English and I try to do my accent as a drunk Ian Paisley [the Irish politician]."
Louis clearly approved of the show after being won over by Ashley as he claimed it was "fantastic" and even admitted that he's thinking of booking another ticket.
He said: "I'm going to come back again and again. It's funny, it's brilliant and it's got the X Factor."

Backstreet Boys' Howie Dorough says One Direction remind them of the "mania" in their heyday.
The boy band - who were catapulted to the spotlight in the 90s - warn Harry Styles, Zayn Malik, Louis Tomlinson, Niall Horan and Liam Payne not to "burn out" and "pace" themselves since it's easy to get "lost" in the excess of the music industry.
Howie told the Daily Star newspaper: "One Direction remind me so much of us back in the day, all that mania.
"It's a marathon, not a sprint, so pace yourselves so you don't burn out too quickly.
"They have credited us as their inspiration, which is very flattering, but I can see how people get lost in this business when it comes to excesses in fame, success and money."
Howie - who was catapulted to the spotlight alongside band mates A. J. McLean, Nick Carter, Kevin Richardson and Brian Littrell - insists 1D should "keep their feet on the ground" if they want long-term success.
He added: "If we give 1D advice, would they even want to take it? I don't know if we would've at their age.
"But people who keep their feet on the ground don't go away, so they need a good support system around them.
"If they write great, timeless music and be good to their fans long career."