Jensen Ackles and his longtime girlfriend Danneel Harris are engaged, her rep confirms exclusively to JustJared.com.

The 31-year-old Supernatural actor and 30-year-old One Tree Hill actress have been dating for about three years but have been friends for nearly a decade. The couple, who are longtime members of the WB/CW family, co-starred in the 2007 romantic comedy Ten Inch Hero.

Danneel showed off her beautiful engagement ring on Saturday at the Breeders’ Cup in Los Angeles.

Congrats to the happy couple!