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That looked fun!
Rob Lowe's son John turned 21-years-old on Sunday, Nov. 6 — and the family celebrated his milestone birthday by taking a memorable trip to Las Vegas over the weekend!
View this post on Instagram#birthday #vegas 21 and done!!
A post shared by Rob Lowe (@robloweofficial) on
"#Birthday #Vegas 21 and done!!" the Brothers & Sisters star captioned the snapshot of himself, his wife, Sheryl Berkoff, John and the couple's older son, Matthew, 23, at a club. Who says you can't party with your parents?!
MORE: Rob Lowe Gets Slammed at His Comedy Central Roast — See the Funniest Jokes!
Rob and Sheryl — who married in 1991 — previously welcomed John in 1995 and Matthew in 1993.
Click through the gallery below to see more of Hollywood’s cutest families!
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The Smith Family
Will Smith and Jada Pinkett Smith with kids Trey, Jaden and Willow.
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The Jolie-Pitt Family
Brad Pitt and Angelina Jolie with kids Maddox, Pax, Shiloh, Zahara, Knox and Vivienne.
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The Lopez Family
Mario Lopez and Courtney Lopez with kids Gia and Dominic.
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The Beckham Family
David Beckham and Victoria Beckham with kids Brooklyn, Romeo, Cruz and Harper.
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The Brady Family
Tom Brady and Gisele Bundchen with kids Benjamin and Vivienne.
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The Kushner Family
Ivanka Trump and Jared Kushner with kids Arabella, Joseph and Theodore.
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The Baldwin Family
Alec Baldwin and Hilaria Baldwin with kids Carmen and Rafael.
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The Song Family
Lisa Ling and Paul Song with daughters Jett and Ray.
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The Duhamel Family
Josh Duhamel and Fergie with son Axl.
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The Burtka-Harris Family
Neil Patrick Harris and David Burtka with twins Harper and Gideon.
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The Henchy Family
Brooke Shields and Chris Henchy with daughters Rowan and Grier.
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The Obama Family
Barack Obama and Michelle Obama with daughters Malia and Sasha.
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The Broderick Family
Sarah Jessica Parker and Matthew Broderick with son James Wilkie and twin daughters Tabitha and Marion.
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The Urban Family
Keith Urban and Nicole Kidman with daughters Sunday Rose and Faith Margaret.
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The Royal Family
Prince William and Kate Middleton with kids Prince George and Princess Charlotte.
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The Warren Family
Cash Warren and Jessica Alba with daughters Honor and Haven.
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The McConaughey Family
Matthew McConaughey and Camila Alves with kids Levi, Vida and Livingston.
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The Witherspoon-Toth Family
Reese Witherspoon and Jim Toth with kids Ava Phillippe, Deacon Phillippe and Tennessee Toth.
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The Goldberg Family
Soleil Moon Frye and her husband, Jason Goldberg, have daughters Poet Sienna Rose Goldberg and Jagger Joseph Blue Goldberg and sons Lyric Sonny Roads Goldberg and Story Goldberg.
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The Ripa-Consuelos Family
Kelly Ripa and her husband, Mark Consuelos, have sons Michael Consuelos and Joaquin Consuelos and daughter Lola Consuelos.
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The Lowe Family
Rob Lowe and his wife, Sheryl Berkoff, are parents to two sons, Matthew Lowe and John Lowe.

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