Sorry, Selena. It seems that Taylor Swift has just found a new BFF in Sara, a.k.a. a muscular Jimmy Fallon in a purple dress.

Swift made her debut appearance on the "Tonight Show" sketch, "Ew!" as nerdy Natalie Benson, donning glasses, braces and a pink top.

"Ew!" is a recurring sketch on the late night show which revolves around Sara, a teenage girl who hosts her own television show from her basement. Sara is played by "Tonight Show" host, Jimmy Fallon.

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Other stars who have joined in on the "Ew!" fun include Michelle Obama, Channing Tatum, Zac Efron and Seth Rogen.

Fallon as Sara introduces the 24-year old singer as the daughter of her mom's best friend in college.

Sara asks Natalie to share with the audience a little bit about herself. To which Natalie replies that she's 13 years old, she likes apricots and she has a band-aid collection. "Ew!" Sara says.

Natalie shares that she likes building popsicle castles by herself. Sara pauses for a bit then shares, "I so can relate!"

Sara suddenly shifts the questioning and asks Natalie what her favorite show is. Before Natalie can reply, Sara excitedly says that hers is "Pretty Little Liars". The shy and awkward Natalie says her mom hasn't allowed her to watch television "ever since Miley started to twerk."

Hilarity ensues as Sara aggressively tells Natalie that she would like "Pretty Little Liars" if she watched it. 

The two then proceed to a show-and-tell. Natalie shows a picture that she drew of a made-up animal she calls "a pegacorn...a unicorn and a pegasus in one."

Natalie sneezes. Sara is grossed out and starts spewing gibberish. 

Sara suggests that they should start dancing to her favorite song, "Come and Get It" by Swift's best friend, Selena Gomez.

While the two dance, Sara's father goes down to the basement and embarasses her in front of her new friend.

After Sara manages to kick out her father, the two play a picture game which ends with Natalie saying "Ew!" to a photo of a broken heart and, a broken heart with a band-aid. Sara asks her what she thought about getting back together with an old flame, asking "Never?" Natalie replies, "Never, ever, ever, never. Never."

Tagstaylor swift, Jimmy Fallon, Nerdy Natalie, Video