Mark is in Sin City with a group of family and friends (38 to be precise) - including TOWIE's Elliott Wright and James 'Arg' Argent - ahead of his summer wedding to Michelle Keegan.
Aisleyne, who is in Vegas with close pal Nicola McLean, shared a photo with fans on Twitter after bumping into Mark.
Wearing white lace co-ords, Aisleyne captioned the photo: "The lucky man himself @MarkWright_ marrying the wonderful @michkeegan #Vegas."
Mark left Essex for Vegas on Wednesday and was pictured at the airport wearing a customised slogan T-shirt, which read: 'Vegas 6 May-12 May 2015: The Wright Way'.
SInce then, Elliott has given fans a glimpse of how he and Mark spent their first 24 hours in Vegas. Making the most of their time, Mark and co. were seen partying up a storm poolside.
While Mark is enjoying his stag in Vegas, Michelle, who is now back home, took her girls to sunny Dubai.
In fact, this week, Michelle talked more about their upcoming wedding, saying she has been grateful for Mark's input.
She told ITV's Loose Women: "No, I'm not getting the hump, I'm thinking, 'Thank you very much'. I'm the most disorganised person you'll ever meet, where Mark is the opposite, so it's balancing quite well.
"I am thinking, 'Thank god he's getting involved as I need help'. It's working really well. There haven't been any arguments yet, well apart from the table plan."
The couple told fans over the weekend that they were getting the table plan sorted, as they have to cater for 200 guests!
"That's our family and our close friends," Michelle told the panel. "That's how big are families are together."
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Recap Mark and Michelle's romance: