Armstrong, who drives for Chip Ganassi Racing, is tied for 18th place in the drivers' standings after a tricky start to the season.
The highlight of his season so far remains a fifth-place finish in the $1 million challenge race, highlighting how much potential there is to enjoy success.
There is plenty of learning ahead for Armstrong, but Cullen seems to be enjoying working on the other side of the world for now, away from the craze of Formula 1.
In a post on Instagram, she mentioned taking ‘risks’ in a quote from 20th century poet T.S Elliot while also featuring in pictures alongside American actress Nazanin Mandi wearing a Chip Ganassi race suit.
It follows postings of Armstrong's growing relationship with Cullen, including the trio together in a group picture, and also an amusing video of Cullen making 'the breakfast of champions' for the racing star.