Ryan Phillippe Bares Tattooed Muscles on Bike Ride with Son Deacon!

Ryan Phillippe is showing off his muscles!

The 45-year-old actor leads the way as he and son Deacon went out on a bike ride on Saturday afternoon (September 21) in Brentwood, Calif.

PHOTOS: Check out the latest pics of Ryan Phillippe

Ryan bared his buff, tattooed biceps in a sleeveless gray shirt as he enjoyed a day out with his 15-year-old son.

If you didn’t know, Deacon is a budding music producer – you can check out some of the tracks he produced on his Beat Stars profile here!

10+ pictures inside of Ryan and Deacon Phillippe out on their bike ride…