Mum Victoria took her eldest son as her plus one, and he was super-smart in a fitted black suit.
Posh herself was also looking on top form in a corset top and wide-leg pants ensemble from the Maison Martin Margiela Spring 2013 collection.
Of course, a piece from her own range came in the form of her Victoria Beckham Spring 2013 gold clutch bag.
That's one stylish mother-son duo.
See all the pics from the starry bash here: