In honor of Jennifer Aniston's 40th birthday today, we're marking the occasion by taking a look back at her nearly 20 years in show business. She truly became America's Sweetheart in 1994 with Friends, but she continues to hold the title because of the humor and grace she brings to both the big and small screens. Take a peek through our slideshow at some highlights from Jen's first 40 years.
Happy 40th to Jennifer Aniston!
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