Posh, dressed in black, and Becks were seen arriving at The Fat Badger for the glittering dinner along with their youngest son and his girlfriend Jackie Apostel.
The short duet features in a montage of performative video clips shared by Apostel across social media as she paid tribute to Cruz on his milestone birthday.
Cruz Beckham looked in good spirits as he enjoyed a date night with girlfriend Jackie Apostel at Paul McCartney's new Prime Video documentary Man on the Run screening on Wednesday night.
Sometimes all you need is love, and so it proved on Monday evening as Beatles obsessed Cruz Beckham celebrated his 21st birthday with an extended group of his nearest and dearest.