Married At First Sight's Billy Vincent was introduced to viewers as a 'barista' when he joined the social experiment last week. 

But some fans were left confused when the 28-year-old offered his 'wife' Susie Bradley a cup of Moccona instant coffee with sweetener during Monday's episode. 

Taking to Twitter to mock his apparent lack of skill, several people accused the cheapskate groom of lying about his profession. 

'BILLY THE BARISTA HAS MOCONNA? Where's your single origin fair trade espresso, babe? I'm calling bulls**t,' one person tweeted. 

Another viewer was so unimpressed they suggested that Billy 'needs remedial training' in coffee making. 

However, it's not the first time fans have been left confused by Billy's profession. 

When he debuted on the show, Billy was introduced as a barista and personal trainer, but on the MAFS website he was billed as 'personal trainer / model'. 

Details of Billy's modelling career came to light on Monday's episode, when he unveiled a series of professional nude photos of himself to Susie.

'You need to appreciate it in its normal habitat,' Billy said, referring to his flaccid penis.

Looking rather impressed, Susie replied: 'It's definitely not the worst looking thing I've seen in my life.'

After gathering her thoughts, she added: 'When I saw Billy's penis I certainly wasn't not impressed, let's just put it that way.'

The pictures were all taken by an older gentleman named John Bortolin, who also featured in the episode and is Billy's close friend.