Alyson Hannigan

Born March 24, 1974, best known as Willow Rosenberg on Buffy the Vampire Slayer and Lily Aldrin on How I Met Your Mother.

She had small roles in films like My Stepmother is an Alien (as the daughter) and Dead Man on Campus before her breakout film role as Michelle Flaherty in American Pie, where she shocked everyone with the line "This one time, at band camp, I stuck a flute in my pussy." The world was never the same after that moment. It's always the quiet ones.

Married to her former Buffy co-star Alexis Denisof, and a mother. For many years she starred in the hit sitcom How I Met Your Mother as Lily; additionally, since 2016 she's been the host of the Stage Magic competition show Penn & Teller: Fool Us. Her daughter seems to have taken up her mother's banner of truly ridiculous levels of cute.

She has even been immortalized in the song "Alyson Hannigan" by the Klopecs:

I first saw you when I was ten,
Your stepmother was an alien.
You were attacked by an alien bag.
Dan Aykroyd he was your dad.

One day I turned my TV on
I saw you dancing at the Bronze
Where all the kids just wanna dance.
Oh Willow, I wanna be your man.

Oh Alyson, Alyson Hannigan
I can't wait until the day I see you again.
A, A, Lyson.

Alyson Hannigan provides examples of the following tropes:

Adorkable

Willow: You're supposed to stop me when I do that.
Oz: I like it when you do that.

Cat Smile: You know that unique way her mouth is shaped when she smiles?
Covert Pervert: Her most common role.
The Cutie
Genki Girl
Hot Mom
Older Than They Look
Puppy Dog Eyes

Joss Whedon: "There is nothing more painful in the world than Aly when she makes her big eyes. She makes her big, hurt eyes, there's nothing you can do. She just kills you."

- Lampshaded in a Empowered strip. She makes the demonwolf, violator of the worlds, cry.

Thugboy: "This Alyson Hannigan is a menace."

Romance on the Set
Tear Jerker: Joss Whedon has stated that any time he wants the audience to cry, all he has to do is have Alyson Hannigan cry.
Throw It In: Her last scene in American Pie. You know the one.