Remember little Kylie Jenner as a tween making the occasional Kardashian family TV cameo? Well, that little girl is all grown up; 17 years old as of this weekend. And after spending Saturday night partying with some of Hollywood's biggest names we know that as hard as this girl works (more on her accomplishments over the past year to come), she certainly knows how to let loose too.

On Saturday evening Kylie was the guest of honor at her late night birthday soiree, celebrating with her sister Kendall (of course) as well as an entourage of musical megastars that included Tyga, Justin Bieber, The Game and Chris Brown.

A video taken at the party shows Kendall rocking out to 50 Cent's "In Da Club" as she feasts her eyes on what she's about to blow... out when it was time to light the candles and make her birthday wish -- a huge and oh-so-classy penis cake! Yum.

[Check out the cake in this video]

Another video reportedly surfaced showing Kylie surrounded by her friends as she held a glass in her hand while being peer-pressured by her bad boy b-day clique to "take a shot!" But the birthday girl allegedly resisted and according to her reps even after the film stopped rolling the little lady did not imbibe on any alcohol all evening.

So even under the pressure of a celebratory atmosphere this girl can hold her own and keep up appearances and behavior despite some of the hijinks her Hollywood cohorts engage in. This level of maturity was definitely an ingredient in the super-successful past year, which was full of memorable and noteworthy accomplishments on Kylie's part.

MTV reported on her recent success stories this week, noting that "she's still barely old enough to drive ... And yet, she has managed to build on the bizarre, runaway success of her reality star family in ways that are well beyond a teenager's normal scope."

Here's the low down on Kylie's impressive accomplishments since her last birthday...

This multi-faceted multi-tasker shocked her book-loving fan base by publishing her first novel this year, titled "Rebels: City of Indra - The Story of Lex and Livia." Described as a "fast-paced dystopian thriller," Kylie co-authored it with her best friend and partner-in-crime, sister Kendall Jenner.

With all of the love in this young lady's life, 17 is destined to be her best year yet, no doubt.

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