If proof was needed that Victoria Beckham was the real driving force behind husband David's move to a Los Angeles football club, then this was certainly it.

Victoria organised the £100,000 surprise party to celebrate David's 32nd birthday and their move to America - and spent the evening and the next day plotting and planning The Spice Girls' reunion assault on the US.

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Girl Power: Mel and Geri leave the Sanderson hotel hand-in-hand.

Spice Girls reunited: The partying Spice Girls get together once again to discuss, babies, paternity battles - oh and the small matter of a £1million reunion show

And afterwards, the Spice Girls seemed to be as inseparable as ever, with Geri and Mel B spotted leaving the Sanderson Hotel hand-in-hand to go shopping, and Emma joining them later for dinner at The Ivy restaurant in London's West End.

At David's party, Victoria spent much of the night going over her detailed plans for the girl group's reformation in Hollywood.

Mel and Geri leave restaurant The Ivy where they dined with Emma Bunton

A guest at the meal told the Mail: "Victoria told him it was just going to be the parents and his sister Jo for a quiet little dinner.

"But when they got there it was surprise after surprise after surprise as Geri Halliwell, Mel B and Emma Bunton turned up. Then Kelly Hoppen arrived - who is totally Victoria's friend, and Gordon and Tana Ramsay.

"David was already getting quite emotional about Victoria making such an effort for him. He was looking pretty glassy-eyed with everyone telling him how much they would miss him and wishing him happy birthday," said the friend.

But it wasn't long before the former England captain was reduced to tears.

"Victoria was making a speech saying how much she loved him, what an amazing father and husband he was and how she felt blessed to have him in her life, and then when everyone round the table was shouting 'hear, hear', that's when the waterworks started.

"He was blubbing and Victoria threw her arms round him."

But it seems that it was down to business moments later when Victoria gathered together the former girl band members to go over her plans to conquer the US.

"Victoria was saying she wanted her new Los Angeles home to be HQ for The Spice Girls reunion in the US.

"She wanted all four of the others (Melanie Chisholm is apparently also being worked on to reunite) to fly out to join her when they move out for David to start training for LA Galaxy.

"She was saying it would be like a boot camp - and that she was already planning to have a dance studio built in the new house,' said the friend.

The Beckhams arrive at Cipriani

Girl power was back in force with the arrival of Melanie Brown, Emma Bunton and Geri Halliwell. The former Ginger Spice also brought David Walliams along for the night

"She wanted to get the singing back on form and the dance moves together. She was talking of an American tour and even a Christmas No1 in this country.

"But the funny thing was that when it came to singing 'happy birthday' to David, none of them appeared to be able to sing in tune.

"The four of them were belting it out as if they were at Wembley Stadium - but their voices were all over the place.

"Clearly though, they were all keen to get in shape because they barely ate anything all night - though lots of wine was drank. Victoria was slurring her words a bit towards the end of her speech."

But it seems Victoria also went to considerable lengths to make the birthday memorable for David.

The friend said: "She was telling all the girls how she had bought herself some lacy Agent Provocateur underwear which she would model for him in the private jet back to Madrid later that night.

"Victoria was even joking that for David's final birthday present, she would give him a 'special surprise' when they were up in the clouds. Victoria was saying that in the private jet, the pilot cannot see in".

Victoria also had made for David an eternity ring with five inset diamonds - one for him, her and their three boys - to be worn on a platinum chain "next to his heart".

Earlier in the day, Victoria had also treated David to a £14,000 watch, a £4,500 suit, a £1,900 pair of hand-made shoes and £400 worth of designer shirts in a shopping spree costing £20,000.

With the hotel bill of £2,500 at London's new Haymarket Hotel, a restaurant bill of £25,000, a private jet costing £8, 000 each way, the specially-commissioned diamond ring costing £40,000 and drivers and security arranged for the trip, the total bill for David's birthday trip came to more than £100,000.