Lucille Ball and Desi Arnaz's daughter Lucie Arnaz posted a sweet birthday message to her brother, Desi Arnaz Jr.

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.

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“Happy birthday to my soulmate and best buddy. My beautiful baby brother, Desiderio Alberto Arnaz IV,” Lucie Arnaz, 73, wrote in the Monday, Jan. 20, post. “He is one of a kind. Brilliant thinke ...

Lucille Ball and Desi Arnaz; Lucie Arnaz and Desi Arnaz Jr. as children in the 1950s ...