1/3 Rob's son Johnny turned 21 in Sin City. Photo: Instagram/@johnnylowe 2/3 Johnny was joined by his famous father and friends for his birthday weekend in Vegas. Photo: Instagram/@robloweofficial 3/3 Discussing the Vegas festivities, Rob said, "It got wild for these kids.” Photo: Instagram/@robloweofficial © ¡HOLA! Prohibida la reproducción total o parcial de este reportaje y sus fotografías, aun citando su procedencia. Más sobre: Rob Lowe Más noticias sobre Rob Lowe Kate Beckinsale reveals marriage proposal to teen crush Rob Lowe