Swaggering EastEnders star Danny Dyer was pictured naked by a starstruck 21-year-old while he spent the night with her behind his loyal partner's back.

The bad boy actor, who plays Queen Vic landlord Mick Carter, homed in on the young brunette at a club and they went back to her bedroom.

The pair swapped numbers after their night together a month ago and the student hoped Dyer, 36, would contact her again – but he never did.

She showed the mobile pictures to a pal and they have since been shown to the Sunday Mirror.

Dyer has previously admitted to betraying girlfriend Joanne Mas – the mother of his three children – but recently described her as his "f****** rock".

Just weeks before his night with the student, he was pictured at Joanne’s side at the premiere of new film The Hooligan Factory.

They have been together 19 years.

But all that was forgotten as Dyer spotted the student on a night out with pals last month.

A friend close to the girl – who did not want to be named – said: "Danny clearly fancied her.

"She is very, very pretty.

(Image: Sunday Mirror)

"Of course she recognised him straight away too.

"And you don't expect to see somebody who has been in so many films and on TV in your local nightclub.

"He got chatting to her and was very flirty – and she was pretty flattered that someone famous was showing an interest.

"She certainly fancied him too, and found him very charming and likeable.

"She wasn't sure whether he had a partner when they started talking, but the conversation flowed really easily between them both and kept on almost all night.

"They had a few drinks and when it got late they decided to leave together.

"She was a bit embarrassed afterwards, and told her friends that he had gone back with her.

"It really isn't the sort of thing that she would normally do, and she certainly wouldn't have taken pictures with a man, but was a bit starstruck and carried away in the moment.

"She couldn't believe she ended up in bed with someone like Danny Dyer as he could have had the pick of anyone.

"But she was disappointed at not hearing from him afterwards.

"She couldn't help sharing what had happened with me and other close friends.

"Some didn't believe her until she showed them the pictures.

"At the time she had no idea Danny was in a relationship but now she knows he is she realises it will be never anything other than a one night stand."

(Image: WENN)

Dyer, who has starred in films including Human Traffic and Football Factory, joined BBC soap EastEnders last year.

His fiercely loyal persona on the show, which has won him a legion of fans, has not been matched by his behaviour off it.

In 2009 he admitted to cheating on Joanne saying: "I've done so many things I've regretted.

"I've royally f***** up with my missus.

"I got caught doing something I shouldn't have.

"I hate myself for what I did and for being tempted by forbidden fruit."

Then last year in an interview with the Daily Mirror, the actor claimed that, although he was never short of female admirers, he was not a cheat.

Asked about rumours that he had cheated on Joanne again, Dyer said: "Of course I f*****’ haven't.

"Jo is my baby, she's the mother of my f*****’ children and she’s my f*****’ rock.

"I have birds throwing themselves at me every f****** day I leave the house – of course I do.

"I like the power of it.

"As long as I don't go there, it's fine."

In January we revealed how the actor had been involved in a threesome at a hotel room in Blackpool.

Cara Chamberlain and a female pal bedded the actor who later gave them both "gifts" of his own T-shirts to remember the night.

A pal said at the time: "Cara is not proud of what happened that night – but at the same time she is not in denial about what went on.

"Danny on the other hand likes to give the impression he bats away girls, but it certainly wasn't the case with her.

"He was even talking about Jo and his kids when he was with Cara.

"He said that they were still together, but it didn't seem to bother him."

And just weeks before that, blonde Laura Boyd told how she slept with the star several times at a Belfast hotel, saying: "I was like, ‘Wow, OK’.

"It's not every day a famous movie star invites you back to his hotel.

"When I went back to the hotel I really didn't think I was going to end up sleeping with him.

"But it just happened.

"I was lying on the bed while he was sitting by the window.

"Then he just came over and kissed me.

"It was the best sex I have ever had."

Dyer made his debut on EastEnders last year.

He has proved an immediate hit with viewers alongside his new on-screen wife Linda, played by Kellie Bright.

The pair made their first appearance on Christmas Day, taking over the pub from Alfie Moon.

He has been with Joanne since 1995 after the pair met as teenagers.

The third of their three children was born last year. Yesterday Dyer was mobbed by fans as he turned up to sign copies of his book – called the Films of Danny Dyer – at the Lakeside Shopping Centre in Thurrock, Essex.

A source said Danny was aware of the images' existence, but had hoped they would not emerge.

Last night Dyer declined to comment.

Dyer in EastEnders: