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Who's that handsome man listening to music at the gym? It's Rob Lowe's 20-year-old son, that's who!

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A shirtless Rob posted this gym selfie with his son, John, on Instagram on June 23, 2015, along with the caption, "Generational #Fitness with @johnnylowe #Essential #Results #ForeverYoung #Profile4Men."

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While it appears that Rob and John like to bro out at the gym together, we've noticed how much the father-son duo look alike. The Lowe family certainly has some good genes!

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Rob and wife, Sheryl Berkoff, also have a 22-year-old son together named Matthew.

So we gotta ask: Can we get a gym pic of him too, please?!