Watch Jennifer Hudson's Son Sing His Heart Out Jennifer Hudson's son, David Jr., may have his daddy's muscles, but he definitely has his mama's voice. The award-winning actress and singer shared a video of her 7-year-old singing "Happy Birthday" to

his daddy, David Otunga, who is celebrating his 37th birthday today. Jennifer captioned the video, "U betta sing to your dada on his bday n mean that it! Sing my baby!" And that's EXACTLY what he did! Watch the clip below.