03/29/2016 AT 11:55 AM EDT
Say hello to Brad the Builder!
The Big Short star, 52, gave shoppers a post-Easter surprise on Monday, when they spotted him rummaging through the shelves at a west London branch of hardware chain B&Q in search of DIY equipment.
"Nobody knew he was in the store until he went to the till," a staffer at B&Q tells PEOPLE. "Then everybody was like 'Oh my God, it's Brad Pitt! What's he doing in here?!' "
The dad of six, who's currently in the British capital filming an untitled World War II spy drama costarring Marion Cotillard, hinted that deep down he's just a regular Joe when he picked up some drill parts from the store.
While wife Angelina Jolie did not join Brad for the lunchtime excursion, he was ably supported by son Knox, 7.
"It was totally random. He just puttered around like any other customer," says the staffer. "Nobody knew he was coming, so nothing special was laid on. But then he's just a person like everyone else, isn't he? He just has a different job and earns a bit more money than most.
"He was very down to earth and polite and his son was very well behaved," the employee adds. "They were not 'movie starry' at all."
This is not the first time that Brad has displayed his hands-on approach with Knox. Earlier this month, he treated him and twin sister Vivienne to a pottery painting session in London – and even took the time to create a "Brad Pitt original" himself.
"It was just Brad and the twins doing the painting together," a source tells PEOPLE of the excursion, which happened a day before the U.K. celebrated Mother's Day. "They were in the pottery cafe for a couple of hours and seemed to have a lovely time. They were very happy."
Brad Pitt spotted buying DIY supplies at London B&Q https://t.co/kcWxxCDFnk pic.twitter.com/vbPH4ViNaC— Evening Standard (@standardnews) March 29, 2016
The Tweeter, using the handle Harish, appeared to work in the store and during his shift on Easter bank holiday Monday, he was left bewildered at his star spot.
Posting the snap of the A-lister standing at the checkout, Harish added the caption: 'S***test photo ever, but Brad Pitt was at my work today'.
Meanwhile, a source who was also in the store, exclusively revealed to MailOnline that Brad was enjoying his casual shop alongside two of his six children.
The insider said: ‘He just looked like any other regular dad going about his Bank Holiday Monday. The kids were extremely polite and he kept moving them out of the way so other people could get on with their shopping. You’d never guess it was one of the most famous men in the world.’....