The boyfriend of fashion giant Calvin Klein is reportedly in rehab after being taken into custody by police for allegedly punching a man who was partying at his penthouse in New York City.

Former porn star, turned model Nick Gruber is said to have checked into a rehab facility in Arizona following the incident.

Media is reporting police found cocaine on Gruber and he has been charged with drug possession, misdemeanours of assault and resisting arrest.

Gruber has been in an on again, off again relationship with Klein since 2010.

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