Beckham was seated in the proximity of his former boss Sir Alex Ferguson and both men were treated to an emphatic display.
The former England international, wearing a navy suit, watched as Juan Mata, Marouane Fellaini (2) and Romelu Lukaku netted for the Red Devils.
Take a look at the snaps here:
Mourinho and Beckham after the game today. pic.twitter.com/tBhHGbpjAs
— Man Utd Channel (@ManUtdChannel) September 30, 2017
David Beckham watching #mufc with Dave Gardner pic.twitter.com/pziysD5CO5
— Samuel Luckhurst (@samuelluckhurst) September 30, 2017
Sir Alex and David Beckham at Old Trafford . #mufc pic.twitter.com/EPlpwcDvJy
— Valar Morghulis (@SemperFiUnited) September 30, 2017