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Recognize the Reveler

Courtesy of Ethan Miller/WireImage

Like father, like son!

This child of a Hollywood legend and his famous dad, whose birthdays are one day apart, celebrated their milestones together this weekend.

In true VIP fashion, the father-son duo had a joint party Saturday in Sin City, where they stayed in a two-story villa with an entourage of 30 friends and got a custom cake to commemorate their double B-days.

Think you know who his dad is? Find out after the jump...

Marston Hefner, Hugh Hefner

Courtesy of Ethan Miller/WireImage

It's Marston Hefner, son of 85-year-old Hugh. (The Hef's birthday was on Saturday, while his son's was on Sunday.) 

The boys stayed at the Palms Resort in Hugh's namesake suite and partied at  the Moon nightclub and the Playboy Club, natch.

They were joined by Hugh's 24-year-old fiancée, Crystal Harris.

Hmmm, wonder if it's weird that Marston's soon-to-be stepmom is much closer to his age than his dad's?