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Tabloid sources alleged that the Dan "kissed" Alexandra at Neighbourhood bar in Manchester on a night last week 'behind his wife's back'.
But both parties have since denied the allegations, saying they are nothing more than friends.
In a joint statement, representatives for Dan and Alexandra said: "Absolutely nothing happened with Alex - Dan has been friends for a while with her after working together.
"They all met up with friends and enjoyed a great night out like friends do."
A source told The Sun that the former TOWIE star was "thrusting" Alexandra on the dance floor in the bar.
"He was putting his hands all on her - grinding against her and thrusting his hips. He's a married man so it was pretty shocking. She didn't seem that into it but she laughed it off," they claimed.
"Everyone was talking about how he was acting. There were loads of women there but he was only interested in Alexandra. They left together in a taxi with a couple of friends when the party was over."
And a second 'insider' alleged: "Dan was all over Alexandra. At one point he grabbed her and kissed her."
Other stars attending the event at Neighbourhood bar included Meghan Barton-Hanson, Olivia Attwood and James 'Arg' Argent.
Paparazzi pictures taken from the night show Olivia, Alexandra and Dan all piled into a taxi together with a number of other friends.
Jacqueline hasn't commented on the allegations put against Dan and Alexandra.
Dan and Jacqueline welcomed their second daughter, Mia, eight months ago. They also share another daughter, Ella, four, and Dan has a son, Teddy, five, from a previous relationship.
Dan was hit with allegations he'd cheated on Jacqueline with Love Island's Gabby Allen in 2018, although both strenuously denied anything happened between them.
Jacqueline and Dan, who wed in 2017, split briefly after a series of rows last year, although soon rekindled their marriage.
Pretty52 reached out to Alexandra's reps but had no response at the time of publication.
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