Leo was born on Friday, August 5, and weighed in at a healthy 6 lbs., 12 oz.
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The proud parents-to-be had documented Jillian's pregnancy on Instagram for months.
Harris, an interior designer, became known to TV fans when she was second runner-up on Season 13 of "The Bachelor," and then became the first non-American Bachelorette the following year. She chose Ed Swiderski in her "Bachelorette" finale and even became engaged to him, but they split in 2010.