Happy 51st birthday to the hilarious and talented Alyson Hannigan! It seems like just yesterday we were watching you as the iconic Willow on Buffy the Vampire Slayer, but here you are, another year wiser and even more fabulous. Wishing you a day filled with laughter, love, and all the birthday cake you can handle. Here's to many more years of making us laugh and inspiring us with your amazing acting skills. Cheers to being 51 and fabulous!