Ryan Phillippe's Dating a 20-Year-Old!

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Ryan Phillippe's latest love interest is pretty, blond and young...very young!

Life & Style can confirm that the 37-year-old actor is dating a 20-year old model and actress named Paulina Slagter; the two were spotted having lunch together in West Hollywood this week. "Paulina was on Entourage, and she's trying to do more acting," an insider tells Life & Style. "She's always auditioning and doing modeling."

Although the source says Ryan has been seeing Paulina for a while, don't expect him to settle down with her any time soon. "It's nothing serious, it's just another girl," the source says.

Ryan, who has two kids with ex-wife Reese Witherspoon, previously dated Amanda Seyfried, 26.

Photo Credit: Startraks