Marcus Armstrong achieved his first IndyCar podium at the Detroit GP
Cullen posted a picture of the two on her Instagram story, with them both taking separate ice baths.
The physio captioned the photo 'chilling out’ and hinted at preparations for the upcoming Road America GP.
In a recent interview with the Associated Press, Armstrong revealed that his relationship with Cullen was more than 'trainer-racer' and that the pair now live together.
Cullen frequently posts picture of the pair together in and out of the IndyCar paddock, in what is a proving to be a fruitful partnership in motorsport.