Sean Penn's 4th Of July Jog

Cue the Rocky music! Ha!

Sean Penn went for an early morning jog in Malibu on Independence Day with his personal trainer cycling behind and a new lady, Stacey Koplin, by his side.

The actor has been training pretty hard lately. We wonder if he’s getting in shape for a new movie role or he’s just keeping his 50-year-old body in shape to compete for all the younger women he’s been romantically linked to!

Later on, Penn and Koplin were spotted celebrating the holiday with a day at the Malibu beach riding a jet ski together.

Not much is known about his newest flame, but she’s definitely a hottie with a body! How does this guy do it?

[Image via Pacific Coast News Online.]