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Jimmy Fallon, Kristen Wiig

Lloyd Bishop/NBC/NBCU Photo Bank via Getty Images

Now this is a midnight memory.

Kristen Wiig, one of the scheduled guests on Tuesday's second-ever episode of The Tonight Show Starring Jimmy Fallon, made an impresssion to remember by showing up dressed as Harry Styles.

The Bridesmaids star had the One Direction heartthrob's look down to a tee, from his signature haircut to his white T-shirt, black blazer, layered necklaces and point-toe black boots.

Presumably they traded jokes and talked about work, life (or, should we say, the story of her life) and other normal things, but...

We can't wait to find out if Wiig spoke in a British accent. (And is Harry going to show up later to confront his doppelgänger?! We know he was in London over the weekend, but that's just a short plane ride from New York...)

Also on the lineup for tonight are Jerry Seinfeld and Lady Gaga, who always shows up to places dressed as something.

The pop superstar, who also helped Fallon kick off his new gig last night as one of the celebs who supposedly bet him a $100 that he wouldn't be host of The Tonight Show today, was spotted leaving her hotel in white loose trousers and a furry hooded pink coat.

 Lady Gaga

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Post-taping, Gaga was spotted out in NYC sporting oodles of sideboob in a pleated white apron dress (minus anything under it) and what looked like a Native American-inspired headress.

Lady Gaga

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The Tonight Show Starring Jimmy Fallon, which is starting at midnight instead of its usual 11:35 p.m. this week due to NBC's Olympics coverage, got off to a huge start last night with 11.3 million viewers.

Will Smith, who teamed with Fallon to demonstrate the "Evolution of Hip-Hop Dancing," and U2 (plus all the stars who owed Fallon $100) all helped get the show on the road. 

(E! Online is a member of the NBCUniversal family.)