Lucie Arnaz said her brother "just likes to stay a bit 'undercover'" in an Instagram post on Saturday, Aug. 3. Lucille Ball's son Desi Arnaz Jr. is making a rare appearance on social media.

Lucille Ball might have ... but to Lucie and Desie Jr. Arnaz, she was famous for simply being Mom. And since the two kids, whom she shared with her first husband Desi Arnaz, live a much more ...

Desi Arnaz reached sobriety toward the end of his life, a proud and emotional moment for his children. In this week's issue of PEOPLE, Arnaz and Lucille Ball's daughter Lucie Arnaz, 70 ...

Debra Messing got the ultimate seal of approval when she impersonated Lucille ... Lucie Arnaz — the daughter of Ball and her I Love Lucy co-star/real-life husband Desi Arnaz — was on set ...

Nicole Kidman will play Lucille Ball in the Aaron Sorkin-directed film, while Javier Bardem will play Ball's husband, Desi Arnaz Nicole Kidman and Javier Bardem are going all-in for their latest ...

The 'I Love Lucy' couple's son and daughter posed together in a rare moment. Lucille Ball and Desi Arnaz's daughter, Lucie Arnaz, shares a rare photo of her brother, Desi Jr., on Instagram.

Perhaps the most powerful moment in "Lucy and Desi" — a documentary about Lucille Ball and Desi Arnaz's relationship that also serves as Amy Poehler's documentary directorial debut — is also ...