Kourtney Kardashian decided to treat her son Mason to some early Christmas presents at London’s most famous toy store, Hamleys.

The reality star treated her son Mason to a trip to Hamleys on Friday, bringing her partner Scott Disick along for the fun outing.

But Kourtney Kardashian, 33, seemed to have forgotten that she wasn’t in the States anymore, as she tried to pay for her purchases with American dollars.

Kourtney and her sister Kim Kardashian, 32, have been in London to launch their new clothing range, Kardashian Kollection.

Before the family got to the checkout, little Mason had great fun playing in the store.

The three-year old seemed particularly in awe of the store’s large model railway, getting his father Scott Disick, 29, to help him get a better look.

Kourtney Kardashian, however, looked far less impressed but played to doting mother when they came across a smaller train set.

Kourtney Kardashian treated her son Mason to a trip to Hamleys on Friday, bringing her partner Scott Disick along for the fun outing

Looking like he was in Santa’s grotto, Mason dotted around the store, picking up toys and playthings including a stuffed reindeer.

And Kourtney Kardashian’s eldest child seemed to have done pretty well out of the trip as she left with a very large Hamleys shopping bag.

But as they went to pay for the items, Mason got a little confused and gave the cashier a $100 bill instead of British pounds.

But Mason got to have one of his presents, as he carried a toy killer whale whilst the whole family made their way out of the shop.

Kourtney Kardashian’s youngest child Penelope – born back in July – must have been left with a babysitter and not her sister Kim.

Kanye West’s squeeze had left the Dorchester Hotel earlier in the day to take part in a photo shoot in Central London.

Scott Disick had only just arrived in the capital today, to support his partner with the launch of the Kardashian Kollection for Dorothy Perkins.

Last time Scott Disick visited London he wanted to gain some regal stature, so it’s no surprise that after the trip the family headed over to Buckingham Palace.