Jon Hamm
Jon Hamm is now known for his memorable role as Don Draper in Mad Men, and his prom date became a celebrity as well! He took Sarah Clarke, the future mother of Bella Swan in Twilight, to their high school dance. But at the time, the two were just normal high school students enjoying an exciting milestone in their young lives.

The two look quite adorable here as they pose together for prom photos. Both dressed in black, with Sarah adding some gorgeous diamond jewelry to finish off her ensemble. Incidentally, Sarah Clarke would move on to date actor Paul Rudd, and rumor has it that at one time, the stars have fought over her heart.