They have 34 chart-topping hit singles between them and have sold over half a billion records worldwide.
So when Geri Halliwell-Horner, Emma Bunton, Ronnie Wood, Rod Stewart and Gary Barlow came together for a rendition of Happy Birthday, it may just have been the most star-studded ever.
They were celebrating the 50th of Christian Horner – husband of Geri and head of the Red Bull F1 team.
And the couple were hosts for the lavish evening at Mount St. restaurant in Mayfair on Wednesday.
Sharing a picture of the stars behind a piano, Mrs Halliwell-Horner wrote: ‘A surprise belated birthday celebration for Christian and the supergroup! Gary Barlow, you’re amazing!’
Sharing a picture of the stars behind a piano, Mrs Halliwell-Horner wrote: ‘A surprise belated birthday celebration for Christian and the supergroup! Gary Barlow, you’re amazing!’
![Christian Horner turned 50 with a set of lavish birthday celebrations attended by select stars for a very glamorous evening](https://i.dailymail.co.uk/1s/2023/12/01/21/78441745-12816067-Christian_Horner_turned_50_with_a_set_of_lavish_birthday_celebra-a-2_1701466619527.jpg)
Christian Horner turned 50 with a set of lavish birthday celebrations attended by select stars for a very glamorous evening
![Geri made sure to wear her statement white - although she did have some silver decoration around the neckline](https://i.dailymail.co.uk/1s/2023/12/01/21/78441747-12816067-Geri_made_sure_to_wear_her_statement_white_although_she_did_have-a-6_1701466700711.jpg)
Geri made sure to wear her statement white – although she did have some silver decoration around the neckline
![She captioned the post: 'A surprise belated birthday celebration for @christianhorner And the Supergroup! @officialgarybarlow, you¿re amazing!'](https://i.dailymail.co.uk/1s/2023/12/01/21/78435311-12816067-She_captioned_the_post_A_surprise_belated_birthday_celebration_f-a-3_1701466621161.jpg)
She captioned the post: ‘A surprise belated birthday celebration for @christianhorner And the Supergroup! @officialgarybarlow, you’re amazing!’
![Rod donned a leopard print waistcoat which he paired with some black and white pin striped trousers](https://i.dailymail.co.uk/1s/2023/12/01/22/78434059-12816067-Rod_donned_a_leopard_print_waistcoat_which_he_paired_with_some_b-a-16_1701469405808.jpg)
The 53-year-old model opted for a dark grey sequined dress for the birthday bash which she paired with some gold sparkly heels
![The lavish celebrations even had Take That's Gary Barlow as the star performer](https://i.dailymail.co.uk/1s/2023/12/01/21/78441755-12816067-The_lavish_celebrations_even_had_Take_That_s_Gary_Barlow_as_the_-a-5_1701466666464.jpg)
The lavish celebrations even had Take That’s Gary Barlow as the star performer
![The former chief executive of the Formula One Group Bernie Ecclestone (pictured, left) smartened up in a navy suit as he posed beside his wife Fabiana, 46](https://i.dailymail.co.uk/1s/2023/12/01/22/78434009-12816067-The_former_chief_executive_of_the_Formula_One_Group_smartened_up-a-17_1701469421139.jpg)
The former chief executive of the Formula One Group Bernie Ecclestone (pictured, left) smartened up in a navy suit as he posed beside his wife Fabiana, 46
![Turning heads, Ronnie Wood (pictured, left) wore a black leather blazer which seemed to light up in electronic blue as he added a funky element to his outfit](https://i.dailymail.co.uk/1s/2023/12/01/22/78434037-12816067-Turning_heads_the_musician_wore_a_black_leather_blazer_which_see-a-18_1701469477107.jpg)
Turning heads, Ronnie Wood (pictured, left) wore a black leather blazer which seemed to light up in electronic blue as he added a funky element to his outfit
The 51-year-old Spice Girl wore a glamorous white midi dress with silver embellishments, while her former bandmate Ms Bunton, 47, opted for an elegant black number.
On the keyboard was Barlow, 52, who looked smart in a white double-breasted suit and tan open-necked shirt.
The Take That frontman had earlier serenaded Mr Horner solo, before being joined by Ms Bunton, Mrs HalliwellHorner and former Faces bandmates Wood and Stewart.
Rolling Stone Wood, 76, wore a leather blazer with electric blue highlights while Maggie May singer Stewart, 78, was in leopard print.
They were joined by their wives, with Penny Lancaster, 52, looking sensational in a grey sequined slit dress and gold heels.
Wood’s wife Sally, 45, went all out in a figure-hugging silver gown. Also at the surprise London bash was 93-year-old former F1 supremo Bernie Ecclestone, who was joined by his wife Fabiana Flosi, who is 46.
The pair both wore matching navy blue. The five stars have a combined estimated net worth of more than half of a billion pounds: Stewart (£215 million); Wood (£158 million); Barlow (£90 million); Mrs Halliwell-Horner (£32 million) and Ms Bunton (£24 million).