Singer Justin Bieber spotted wearing a Audemars Piguet

Justin Bieber was recently seen wearing the Audemars Piguet Royal Oak 41mm Automatic in stainless steel, reference 15400ST.OO.1220ST.01, with a black dial — a sighting that confirms the pop star continues to invest in foundational pieces alongside the more flamboyant watches he has worn over the years. The Royal Oak needs no celebrity endorsement, but it gains cultural resonance every time someone with Bieber's visibility reaches for it in preference to something louder.

The 15400ST was introduced in 2012 as an evolution of the 15300, itself a successor to the landmark 14790. It measures 41mm across a steel case just 9.8mm thick, water-resistant to 50 metres, and houses Audemars Piguet's in-house calibre 3120 — a self-winding movement with a 60-hour power reserve, 40 jewels, and a 21,600 vph beat rate. The movement is finished to the meticulous standard AP demands: alternating côtes de Genève and beveled bridges visible through the sapphire caseback. The black dial version, with its deep Grande Tapisserie pattern and white gold applied hour markers, is considered among the most elegant executions in the Royal Oak catalogue.

The 15400ST held its position as AP's primary 41mm Royal Oak offering until it was succeeded by the 15500ST in 2019. That transition instantly elevated the 15400's collector status. The outgoing reference now represents a slightly more restrained design language — thinner lugs, a subtly different dial texture — that purists often prefer. Among the Royal Oak faithful, the 15400 in steel with a black dial is regarded as a clean, no-compromise specification: no date complication to interrupt the symmetry, no exotic material to justify the price beyond the object's own merits.

Bieber has built a genuine watch collection over the years, spanning Richard Mille, Patek Philippe, and various AP references. His choice of the 15400ST black dial signals a collector sensibility that goes beyond trophy acquisitions — this is a watch worn for what it is, not for what it costs.

At an official retail price of $18,780, the Royal Oak 15400ST.OO.1220ST.01 has long been effectively unobtainable through authorized dealers at list. On the secondary market, clean examples trade comfortably above retail, reflecting the sustained demand that defines the entire steel Royal Oak family.