5 Things to Know About the New 'Peter Pan,' Allison Williams

She's more than just a "Girls" star.

— -- intro: It's official -- "Girls" star Allison Williams has been cast in NBC's "Peter Pan Live" set for later this year.

"Dreams do come true! #Girls star Allison Williams will play Peter Pan in #PeterPanLive!" the network tweeted today.

The actress, 26, is well known for her role in the hit HBO show, but there's more to her than meets the eye.

Here's five things to know about the new Peter Pan.

quicklist: 1title: She Comes From a Famous Familytext: Williams is the daughter of NBC News anchor Brian Williams and Jane Stoddard. She was born in Hartford, Connecticut, and is still very close with her family. Brian Williams once told US Weekly that the family gets together every year around Christmas time to watch "Love Actually."

quicklist: 2title: She's Engaged to College Humor Co-Founder Ricky Van Veentext: The news of her engagement was announced this February, and Williams has even worked with her fiance's company College Humor. She guest starred on one of the site's hit shows, "Jake and Amir."

'Girls' Star Allison Williams Is Engaged

Van Veen's humor has rubbed off on Williams, as she also wrote some Funny or Die sketches "Will & Kate: Before Happily Ever After," where she starred as Kate Middleton.

quicklist: 3title: She's a Yale Gradtext: With what may have been one of her first acting/singing experiences, Williams appeared in a video in 2010 for the college, titled "That's Why I Chose Yale."

The video -- which is very "Glee-like" -- features an array of Yale students singing about the university, including the residential housing system and dining halls.

In her part, Williams sings, "A master brings us all together ... hosting study breaks and lectures for when we need time off."

Next, she sings about Masters Teas, which she says, "Are a chance to see all your favorite celebrities. Hear their stories and ask advice," then her father appears on the screen and cracks a joke.

quicklist: 4title: She Has Some Serious Singing Experiencetext: Williams' voice was the driving force behind a viral video posted at the end of 2010, "Mad Men Theme Song ... With a Twist."

The video takes the "Mad Men" theme song from the opening credits and mixes things up. Even four years ago, Williams was making waves for her pipes.

She's also been featured on the "Girls" soundtrack in six episodes, according to IMDB.

quicklist: 5title: She Can Handle Live TVtext: While at Yale, Williams was part of the improv group Just Add Water. So, if things get rough with millions watching her as Peter Pan live on television, she should be able to handle it.