Jane Seymour: 45
Actress Jane Seymour, 61, and husband James Keach welcomed twin sons, Johnny and Kristopher (named after family friends Johnny Cash and Christopher Reeves) in 1995. Seymour, who has two children from a previous marriage, was 44 when she gave birth to the boys. —Xfinity Entertainment Staff (Photo by Alberto E. Rodriguez/Getty Images)
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