Kim Kardashian

It was quite an evening for Kim Kardashian Friday night!

The E! star attended multiple events in New York City—and she wasn't alone.

K.K. started off at the Beauty and Essex Grand Opening event with Spin Crowd stars Simon Huck and Jonathan Cheban, Celebrity Gossip reports. 

Afterward, Kim swapped into a new outfit (natch) and made her way to Madison Square Garden's Z100 Jingle Ball 2010, where she ran into Katy Perry.

"Just bumped into @KatyPerry back stage! LOVE her so much!!!" Kim tweeted.

And of course, she had to take time out to pose for pics with her former Elle love interest, Justin Bieber.

Sounds like a pretty full night, right? Well, it doesn't stop there!

Kim then hooked up with her rumored new guy, New Jersey Nets basketball player Kris Humphries, at Provocateur Lounge, where the pair hung out till 1:45 a.m.

So we have to wonder...what's in store for Saturday?

The reality star flew to Miami to celebrate her friends' anniversary.

She just tweeted, "Happy Anniversary @LorenRidinger @JRRidinger!!!! So glad to be celebrating with u in Miami! Love u guys! Xo"

Whew, it's not easy keeping up with Kim.

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