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16. Katie Holmes
Katie Holmes turned 25 in late 2003, at which point she had already wrapped up her time on Dawson's Creek (the show ran from 1998 to 2003). Believe it or not, she was offered the lead role in Buffy the Vampire Slayer, but turned it down to finish high school. During her time on Dawson's Creek she began venturing into film.

Also while on Dawson's Creek she briefly dated co-star Joshua Jackson, and then went on to date Chris Klein from 2000 until 2005. Then came Tom Cruise, but we don't need to tell you about that.