The woman, who was clocked travelling more than 50kph while applying her make-up, defended her actions, saying she wanted to look her best for a date.
The police video shows Donna Maddock with a compact mirror in one hand and an eye brush in the other.
The video showed her hardly looking at the road as she checked her handiwork.
But it had to be admitted the 22-year-old from Mold in North Wales looked her best when caught on camera.
The police operation had been set up on the A499 in Pwllheli in north Wales to trap motorists using mobile phones.
She was fined 200 pounds (A$474) plus 55 pounds (A$130) costs after she pleaded guilty to a charge of careless driving. She also lost six points from her licence.
A spokeswoman for North Wales Police said the incident "beggars belief".