A tipsy night out leads to Geordie Shore's Marnie Simpson and Aaron Chalmers snogging at the back of a bus!

Geordie Shore fans have been left stunned after Marnie Simpson CHEATED on her boyfriend with Aaron Chalmers.

But Marnie‘s current fella, TOWIE star Ricky Rayment, needn’t worry – the incident happened when his girl was dating previous boyfriend Dan Sloane.

Still, Ricky probably wouldn’t want to see Marnie, 23, locking lips with co-star Aaron at the back of a bus, which is exactly what happened in Geordie Shore on Tuesday night.

Marnie and Aaron, 26, have always had some pretty intense chemistry and it all came to a head when the gang embarked on a wild trip to Wales. After lots of flirting, the duo ended up having a drunken row about why things had never worked out between them.

‘I don’t know if it’s me, her or this house, but for whatever reason, it’s just not meant to be,’ said Aaron.

A frustrated Aaron even smashed a glass after his argument with Marnie – yikes!

Things soon turned around though. Before long the cheeky duo ended up snogging at the back of a bus as the group headed back to their caravan park.

‘Oh my god I’m kissing Aaron, I’m getting carried away and I can’t stop myself,’ Marnie confessed about the shock moment.

The pair then spent the night in Marnie‘s bed. Whilst they didn’t appear to have gone beyond kissing, Marnie admitted to feeling awful the next day and sobbed as she confessed all to Charlotte Crosby.

Marnie‘s guilt then grew even more when she received a bouquet of flowers from boyfriend Dan after the incident – awkward.

The bad timing shocked the housemates, with Holly Hagan saying: ‘What are the chances of your boyfriend sending you flowers the day after you cheat on him?’ Indeed!

A distressed Marnie decided to go and see Dan to sort things out, but we’re guessing things didn’t work out too well given that the Geordie Shore lass is now loved-up with TOWIE star Ricky.

We can’t WAIT to see what happens when the next episode of Geordie Shore airs on Tuesday 12 May at 10pm on MTV.

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Anna Francis