Pauline was emulating iconic painting The Rokeby Venus by Velazquez. It is Velazquez's only female nude and the portrait now hangs in the National Gallery in London.
And Pauline says holding the pose wasn't easy. "I had the most awkward of positions to keep," she told the Herald.
"My neck is completely gone at this stage and the rest of me is slowly but surely seizing up.
"But I used to be a history of art student so I love all this," she explained. "My mother has always painted and one of my first boyfriends was an artist and I posed for him the odd time – never naked mind."
The former Shameless star admits she was somewhat taken aback when she viewed the paintings.
"You see some of the results and you think 'Jaysus I'm not looking my best today' but they are all accurate, I have to say. They're all great."
And Pauline will get to keep her favourite painting.
The actress turned 51 last week but a birthday bash was far from her mind. Instead, Pauline spent the day filming Jason Byrne's upcoming BBC comedy Father Figure.
"It was my last day on set so I worked a 14-hour day," she laughed.
Pauline wasn't the only celebrity to pose for painters in Dublin's RDS.
Moone Boy star David Rawle was a muse along with musician Lethal Bizzle.
Over 1,800 people entered the arts contest. The series finalists will see their work displayed in the National Portrait Gallery.
The winner will be awarded a €11,500 commission to produce a portrait of double-Booker Prize winning author Hilary Mantel.