Newly single Courteney Cox is not dating her Cougar Town co-star Brian Van Holt, RadarOnline.com has learned. Despite the pair being spotted looking flirtatious together on and off the set of their hit TV show their relationship is purely platonic according to his sister.

“As far as I know they are not romantically involved,” Heather Van Holt, Brian’s sister, told RadarOnline.com exclusively.

“We are a very close knit family and he is usually very open with me, I’m sure he would have told me.”

FIRST PHOTOS: Courteney Cox Surfaces Sans Wedding Ring

Since news of their separation went public, there has been speculation that Courtney and David Arquette have an open marriage.